There's this from Tiger:http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1418813&CatId=114
Are you sure you dont want to build it yourself? It's not as hard as is sounds and guides are all over the Internet. If you choose to do so you nearly always get a much better deal (and more powerful pc) for the same price you would a pre-built. This computer is powerful for its price range and should be able to play what you wish, perhaps some games wouldn't run so well on ultra settings. Most games it'll power through though on good settings. Remember though that this has no monitor with it.
Update: read the benchmarks just now on the specific games you mentioned. So it definitely meets the minimum requirements. However it may not be smooth on higher settings. For this price range of a pre built gaming rig this is what you would expect.