yes. that is really good, it might cost around $700 - 800 to build.
the only problem with that is that its a bid, and the price will rise through the roof in the end.
i will try to help too, under $300, might be a little hard, but at least its a challenge.
but quick question, do you plan on upgrading sometime later?
and do you know how to build a computer?
Desktop -Cooler Master NV690/AMD Phenom II X4 965 BE/MSI 880G-E45 Motherboard/2 x 2GB DDR3 G.Skill Ripjaws X/Sapphire HD 5870 1GB GDDR5/CORSAIR CMPSU-550VX/Seagate 7200.12 500GB (OS), Samsung F3 1TB (Storage)/Sony DVD Burner/Windows 7 Professional 64-bit