PEOPLE! PEOPLE! this is the SIMS 2 for God's sake! it doesn't need much. a 6600GT and a 3000+ are way overkill!
you could get by no problem with an ATI Radeon X300, Geforce 6200 or a GeForce 4 MX 440. 256-512MB of RAM should do it and the processor just needs to be over 2GHz. It really isn't that demanding of an application.