diff --git a/src/calibre/ebooks/conversion/plumber.py b/src/calibre/ebooks/conversion/plumber.py
index e33df27412..fa807eb24f 100644
--- a/src/calibre/ebooks/conversion/plumber.py
+++ b/src/calibre/ebooks/conversion/plumber.py
@@ -20,10 +20,6 @@ def supported_input_formats():
         fmts.add(x)
     return fmts
 
-INPUT_FORMAT_PREFERENCES = ['cbr', 'cbz', 'cbc', 'lit', 'mobi', 'prc', 'azw', 'fb2', 'html',
-        'rtf', 'pdf', 'txt', 'pdb']
-OUTPUT_FORMAT_PREFERENCES = ['epub', 'mobi', 'lit', 'pdf', 'pdb', 'txt']
-
 class OptionValues(object):
     pass
 
diff --git a/src/calibre/gui2/__init__.py b/src/calibre/gui2/__init__.py
index a7e088ee1c..934d0b8f2f 100644
--- a/src/calibre/gui2/__init__.py
+++ b/src/calibre/gui2/__init__.py
@@ -11,7 +11,6 @@ ORG_NAME = 'KovidsBrain'
 APP_UID  = 'libprs500'
 from calibre import islinux, iswindows
 from calibre.startup import get_lang
-from calibre.customize.ui import all_input_formats
 from calibre.utils.config import Config, ConfigProxy, dynamic
 import calibre.resources as resources
 from calibre.ebooks.metadata.meta import get_metadata, metadata_from_formats
@@ -49,7 +48,8 @@ def _config():
               help=_('Defaults for conversion to LRF'))
     c.add_opt('LRF_ebook_viewer_options', default=None,
               help=_('Options for the LRF ebook viewer'))
-    c.add_opt('internally_viewed_formats', default=all_input_formats(),
+    c.add_opt('internally_viewed_formats', default=['LRF', 'EPUB', 'LIT',
+        'MOBI', 'PRC', 'HTML', 'FB2', 'PDB', 'RB'],
               help=_('Formats that are viewed using the internal viewer'))
     c.add_opt('input_format_order', default=['EPUB', 'MOBI', 'PRC', 'LIT',
         'HTML', 'FB2', 'PDB', 'RB'],
diff --git a/src/calibre/gui2/convert/bulk.py b/src/calibre/gui2/convert/bulk.py
index 0b48f2521b..393e005e5c 100644
--- a/src/calibre/gui2/convert/bulk.py
+++ b/src/calibre/gui2/convert/bulk.py
@@ -15,7 +15,8 @@ from calibre.gui2.convert.page_setup import PageSetupWidget
 from calibre.gui2.convert.structure_detection import StructureDetectionWidget
 from calibre.gui2.convert.toc import TOCWidget
 from calibre.gui2.convert import GuiRecommendations
-from calibre.ebooks.conversion.plumber import Plumber, OUTPUT_FORMAT_PREFERENCES
+from calibre.ebooks.conversion.plumber import Plumber
+from calibre.utils.config import prefs
 from calibre.utils.logging import Log
 
 class BulkConfig(Config):
@@ -102,7 +103,7 @@ class BulkConfig(Config):
         preferred_output_format = preferred_output_format if \
             preferred_output_format and preferred_output_format \
             in output_formats else sort_formats_by_preference(output_formats,
-                    OUTPUT_FORMAT_PREFERENCES)[0]
+                    prefs['output_format'])[0]
         self.output_formats.addItems(list(map(QString, [x.upper() for x in
             output_formats])))
         self.output_formats.setCurrentIndex(output_formats.index(preferred_output_format))
@@ -117,4 +118,3 @@ class BulkConfig(Config):
         self._recommendations = recs
         ResizableDialog.accept(self)
 
-
diff --git a/src/calibre/gui2/convert/single.py b/src/calibre/gui2/convert/single.py
index ea839e6e80..6d04c7ab04 100644
--- a/src/calibre/gui2/convert/single.py
+++ b/src/calibre/gui2/convert/single.py
@@ -10,7 +10,7 @@ import sys, cPickle
 
 from PyQt4.Qt import QString, SIGNAL, QAbstractListModel, Qt, QVariant, QFont
 
-from calibre.gui2 import ResizableDialog, NONE
+from calibre.gui2 import ResizableDialog, NONE, config
 from calibre.ebooks.conversion.config import GuiRecommendations, save_specifics, \
         load_specifics
 from calibre.gui2.convert.single_ui import Ui_Dialog
@@ -20,11 +20,10 @@ from calibre.gui2.convert.page_setup import PageSetupWidget
 from calibre.gui2.convert.structure_detection import StructureDetectionWidget
 from calibre.gui2.convert.toc import TOCWidget
 
-
-from calibre.ebooks.conversion.plumber import Plumber, supported_input_formats, \
-                    INPUT_FORMAT_PREFERENCES, OUTPUT_FORMAT_PREFERENCES
+from calibre.ebooks.conversion.plumber import Plumber, supported_input_formats
 from calibre.customize.ui import available_output_formats
 from calibre.customize.conversion import OptionRecommendation
+from calibre.utils.config import prefs
 from calibre.utils.logging import Log
 
 class NoSupportedInputFormats(Exception):
@@ -33,11 +32,11 @@ class NoSupportedInputFormats(Exception):
 def sort_formats_by_preference(formats, prefs):
     def fcmp(x, y):
         try:
-            x = prefs.index(x)
+            x = prefs.index(x.upper())
         except ValueError:
             x = sys.maxint
         try:
-            y = prefs.index(y)
+            y = prefs.index(y.upper())
         except ValueError:
             y = sys.maxint
         return cmp(x, y)
@@ -206,11 +205,11 @@ class Config(ResizableDialog, Ui_Dialog):
         preferred_input_format = preferred_input_format if \
             preferred_input_format in input_formats else \
             sort_formats_by_preference(input_formats,
-                    INPUT_FORMAT_PREFERENCES)[0]
+                    config['input_format_order'])[0]
         preferred_output_format = preferred_output_format if \
             preferred_output_format in output_formats else \
             sort_formats_by_preference(output_formats,
-                    OUTPUT_FORMAT_PREFERENCES)[0]
+                    prefs['output_format'])[0]
         self.input_formats.addItems(list(map(QString, [x.upper() for x in
             input_formats])))
         self.output_formats.addItems(list(map(QString, [x.upper() for x in