$57 upgrade, and the only other change was i bought a different tower. i don't like towers with the "mesh" texture, best way i could think of describing it. they stay cooler, but they get so dusty and annoying to clean that i went with a case that was a bit cheaper but a friend of mine has that has never given him problems.
i like the second link, but if you have 900$ and you have a fry's around, i would go there and custom build one. thats what i did and they have awesome deals. good luck on your purchase and let me know what you end up getting. 