definitely GTX 285, GTS 250 is only 9800GTX+, even though in SLI...or if I was you I would get GTX 275, pretty close to GTX 285 and you save nice cash to get second GTX 275 later on...assuming that you have 24inch at 1920*1200, if you have only 1650*1080 one GTX 275 will do perfect job for quite long time, if you are under 1650*1080 treshold...buy new monitor