Benny, I really think it is just the video card. You should be okay.
That said, right now and for the next year or so, (depends upon the AMD Bulldozer platform) building a PC is a real bargain when you look at bang for buck and overall cost. Also....hell you already have the video card, case, DVD burner, and maybe HDD. If you like the case and keep it put new fans in it.
Keep us updated.
When you install the new card's drivers, be sure to use CUSTOM and use the Nvidia utility to clean out the old video drivers for a nice clean installation.