Frustrated by lack of a simple ACDSee equivalent for OS X, I'm looking to hack one up for myself. I'm looking for a gui library that accommodates:

Full screen image display
High quality image fit-to-screen (for display)
Low memory usage
Fast display
Reasonable learning curve (the simpler the better)

Looks like there are several choices, so which is the best? Here are some I've run across:

PyOpenGL
PyGame
PyQT
wxpython

I don't have any particular experience with any of these, nor any strong desire to become an expert - I'm looking for the simplest solution.
What do you recommend?
[Update]
For those not familiar with ACDSee, here's what it does that I care about:

Simple list/thubmnail display of images in a directory
Sort by name/size/type
Ability to view images full screen
Single-key delete while viewing full screen
Move to next/previous image while viewing full screen
Ability to select a group of images for: 


move to / copy to directory
delete
resize


ACDSee has a bunch of niceties as well, such as remembering directories you've moved images to in the past, remembering your resize settings, displaying the total size of the images you've selected, etc.
I've tried most of the options I could find (including Xee) and none of them quite get there. Please keep in mind that this is a programming/library question, not a criticism of any of the existing tools.
it's not an answer to your coding question but for (a big part of) the lack of ACDsee equivalent (requires OSX 10.5+):

Simple list/thubmnail display of images in a directory: Finder.app
Sort by name/size/type: Finder.app will do name & type, not image size (but does file size)
Ability to view images full screen: quick preview (spacebar / eye icon)
Single-key delete while viewing full screen: command-backspace while viewing in quickpreview, both windowed and fullscreen
Move to next/previous image while viewing full screen: both quickprewiew (after selecting a group of images or whole directory with cmd-a) and Preview.app
Ability to select a group of images for[...]: Finder.app will does all but resize

seems like you have everything except resize just pressing the spacebar while in finder.
Preview.app will resize both a single image or multiple ones in one batch.
Python: OSX Library for fast full screen jpg/png display