Best module or CCK field to allow thumbnail view of big picture

Apologies for the poor title as thumbnail view isn't exactly accurate. I am looking for a module, cck field, widget or other method that would let me select a particular portion of an image to be used as a portioned size image in a view2 node content type.

I would like to select an interesting portion of an image sized about 800x600 or maybe smaller instead of trying to proportionally scale & crop a larger uploaded image (1024x768) which would be part of a node with a short description and other fields

I tried to attacha demo image but the spam filter was triggered so removed it

Anyone know a way of doing this in drupal short of uploading 2 images (original & portioned) per node?