I'm trying to get a really cheap build ($400 without HDD). Would it be better to go with the i3-2100 (or phenom II x4 965 BE) and the gtx 550 ti (or gtx 650, not sure) or the Intel Celeron G540 and the gtx 560 ti? I don't know if going with a processer that low will be bad or not. It's mainly going to be doing gaming, but I also want the system to be able to multitask well and not lock up a lot. Any help would be appreciated.