Wow, thanks for all the input guys!
Heat (and consequently noise) are pretty big concerns for me because I like to keep my computer very quiet and i will be running this in a small case (Lian Li A05). I got a taste of silence from the watercooled rig in my sig, so I definitely don't want to hear a graphics card whining away.
I have no doubt that the GTX 460 runs cool so calling it a Thermi may be exaggerating a bit. Based on most of your recommendations, I'm leaning towards the GTX 460 right now but I'm not sure which one I should get.
Can you guys weigh in on the acoustics of your card if you have a GTX 460 or know of a GTX 460 that has a quiet design? And now that the prices have settled down a bit, do you guys think the difference between the 1gb and 768mb version warrants the extra $30-$35?