But I was looking to purchase from Amazon, as I have a $115 Dollar balance (From gift cards) on there, that I could use for this purpose.. So I was wondering if these we're any good, DX11 isn't important..
This is the best you can get for $110 hands down. Sapphire HD 4850 (same model that was linked above for Amazon). I purchased 1 of these for $99.99 ( a few days before it went down to $93.99, now it's $106~).
Overclocks pretty well, comes with default clocks of 650/1000 memory. I got it overclocked to 695 core/1190 memory. With the mentioned clocks it hits around 7k~ 3dmark06 (3D score not system) with my Phenom II B50 x4 @ 3.6 ghz.
Other notes: Pretty quiet considering it's a mid range card (or at least it was a few months ago). Your going to need a 400w+ PSU with at least 21a on the 12v.
An HD 4670 will be enough for GTA IV, or Battlefield Bad Company 2 at resolutions higher then 1280x720 (around 17"~ monitor).
Resolutions for anything higher and your going to have to stick to low to low-mid settings, also lag during intense graphical points (battle scenarios, or where there's a lot of NPCs or players) for Bad Company 2 and GTA 4.
Trust me when I say this, save up and get the HD 4850 with a new PSU.
The minimum power supply I would recommend for the HD 4850 is the Corsair CMPSU-400. It goes for $54.99 on newegg and comes with a $10 mail in rebate.