http://www.frys.com/product/6946087?site=sa:adpages%20page:Mon_P21
or
http://www.frys.com/product/6966057#detailed

The second one has an i5 processor

If I need to, I might be able to get like a new gpu

right around $500 :/

If not what would I need to upgrade on it?

http://www.frys.com/product/6816086?site=sa:adpages%2520page:Mon%2520pg21_03

http://www.frys.com/product/6937507?site=sa:adpages%2520page:fri_p1

If I upgraded the ram would this run TERA?

http://www.pcworld.com/product/27828/dell_xps_400.html