Here's another thing to think about.
With the new Vid Card, you will need a new Power Supply, which could run you as high as an additional 100.00. The 4GB of ram on this is eh..iffy, it's only DDR2. I'm thinking this is probably running the same Motherboard as minew, and something I painfully found out is that you can upgrade the processor, but only to a max of 89 watts. These currently only use 45. You're looking at 600 JUST to try to get this to run (Only Dual Core...Iffy). Since youre in the market for a computer anyway, 700-750 will get you what you need to run this game with all the upgrades you need.
I took some of what you said to heart and found this gaming desktop that's 100% in my budget range, granted It's still just a dual core processor, but everything else seems fine. http://www.newegg.com/Product/Product.aspx?Item=N82E16883229194
Hopefully I'm not annoying everyone by my constant questions. I was made aware to check for Processor Cache, in which this has 1MB x2, it was stated 512 was too little, If I may ask; what is the minimum I should be looking at?
The graphics I cannot tell for the life of me if they are integrated but with the little bit of tech savvyness I have, I feel (though probably incorrectly) that this will run the game on low settings.
Once again, I whole heartedly apologize if I am in fact annoying everyone, however the ZAM community is all I really know in terms of a helpful community to come to for direct and accurate answers. Edited, Sep 2nd 2010 1:35am by Kitprower