Quitoman :
Why would ATI release a card that overheats and freezes at stock settings?
Wow, you were able to troubleshoot the entire line from your one PC, impressive. [:thegreatgrapeape:2]
Just like nVidia, and S3, not everything work for everybody. Obviously you got one of the ones that didn't work for you, now whether that's your fault or the card's has yet to be determined.
The first part of your original gripe shoudl give you an idea that the bottleneck is not in the GPU if turn up / down the resolution has no impact on the framerate. That would not be fixed by changing to any other card, since obviously the bottleneck lies elsewhere. It's also likely the one that's keeping your WOW fps capped too (not that WOW was much of a GPU-oriented game even at the best of times).
The stability issue for HL2 could be a bunch of things, however, first thing first, what did you do to prepare for this card and what did you have before it?
Right now I'm guessing it's a CTKI issue, probably some critical thinking will help you resolve the issue, but we'll see.