diff --git a/.gitignore b/.gitignore
index 51a9ca1d..d67429a2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,4 +6,7 @@ docs/_build
 build/
 dist/
 mongoengine.egg-info/
-env/
\ No newline at end of file
+env/
+.settings
+.project
+.pydevproject
\ No newline at end of file
diff --git a/mongoengine/base.py b/mongoengine/base.py
index 6b74cb07..589042e2 100644
--- a/mongoengine/base.py
+++ b/mongoengine/base.py
@@ -25,6 +25,12 @@ class BaseField(object):
     _index_with_types = True
     _geo_index = False
 
+    # These track each time a Field instance is created. Used to retain order.
+    # The auto_creation_counter is used for fields that MongoEngine implicitly
+    # creates, creation_counter is used for all user-specified fields.
+    creation_counter = 0
+    auto_creation_counter = -1
+
     def __init__(self, db_field=None, name=None, required=False, default=None, 
                  unique=False, unique_with=None, primary_key=False,
                  validation=None, choices=None):
@@ -41,6 +47,13 @@ class BaseField(object):
         self.primary_key = primary_key
         self.validation = validation
         self.choices = choices
+        # Adjust the appropriate creation counter, and save our local copy.
+        if self.db_field == '_id':
+            self.creation_counter = BaseField.auto_creation_counter
+            BaseField.auto_creation_counter -= 1
+        else:
+            self.creation_counter = BaseField.creation_counter
+            BaseField.creation_counter += 1
 
     def __get__(self, instance, owner):
         """Descriptor for retrieving a value from a field in a document. Do 
@@ -87,9 +100,9 @@ class BaseField(object):
     def _validate(self, value):
         # check choices
         if self.choices is not None:
-            if value not in self.choices:
-                raise ValidationError("Value must be one of %s."
-                    % unicode(self.choices))
+            option_keys = [option_key for option_key, option_value in self.choices]
+            if value not in option_keys:
+                raise ValidationError("Value must be one of %s." % unicode(option_keys))
 
         # check validation argument
         if self.validation is not None:
@@ -241,8 +254,8 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
 
                 # Propagate index options.
                 for key in ('index_background', 'index_drop_dups', 'index_opts'):
-                   if key in base._meta:
-                      base_meta[key] = base._meta[key]
+                    if key in base._meta:
+                        base_meta[key] = base._meta[key]
 
                 id_field = id_field or base._meta.get('id_field')
                 base_indexes += base._meta.get('indexes', [])
@@ -491,6 +504,7 @@ class BaseDocument(object):
 
 if sys.version_info < (2, 5):
     # Prior to Python 2.5, Exception was an old-style class
+    import types
     def subclass_exception(name, parents, unused):
         return types.ClassType(name, parents, {})
 else:
diff --git a/mongoengine/fields.py b/mongoengine/fields.py
index e95fd65e..e95312f9 100644
--- a/mongoengine/fields.py
+++ b/mongoengine/fields.py
@@ -12,7 +12,6 @@ import datetime
 import decimal
 import gridfs
 import warnings
-import types
 
 
 __all__ = ['StringField', 'IntField', 'FloatField', 'BooleanField',
diff --git a/tests/fields.py b/tests/fields.py
index 5602cdec..034ec61e 100644
--- a/tests/fields.py
+++ b/tests/fields.py
@@ -644,7 +644,8 @@ class FieldTest(unittest.TestCase):
         """Ensure that value is in a container of allowed values.
         """
         class Shirt(Document):
-            size = StringField(max_length=3, choices=('S','M','L','XL','XXL'))
+            size = StringField(max_length=3, choices=(('S', 'Small'), ('M', 'Medium'), ('L', 'Large'),
+                                                      ('XL', 'Extra Large'), ('XXL', 'Extra Extra Large')))
 
         Shirt.drop_collection()