I have picked out these 2 GPU's they seem to be pretty good???
The first one is my favorite right now..
The only difference between them is the the Memory size and memory clock from what i can tell..!! (difference is underlined)
Go for the 512, unless the cost of shipping would make it out of reach for your budget.
You really don't need 1GB when you're going to play at 1280x1024 or less (don't know the comparable resolution for widescreen). Also the 4670 isn't anywhere near fast enough to really effectively utilize such a big amount of memory, unless your game requires loading 1GB worth of textures.
I play mostly strategy games..!! (controlling tons of troops and stuff like that)
resolution is 1680x1050
Right now with the on board video (ATI Radeon HD 4200)
Empire: Total war - (need more graphic power)
Rome: Total war - (runs OK) can have 18,000 troops in one battle without lag at med graphics
Blitzkrieg 2 (runs GREAT) full settings
Stronghold 2 (runs GREAT) full settings
Gettysburg (runs GREAT) full settings