If you live in PJ, Gamers Hideout is the best (so far), they've got the latest games and stuff for the 360. Best part, the prices are fair and the stock for the hot games comes pretty fast.
I used to go down town to Mario in Imbi plaza, but with Gamers Hideout, I'm hoping those days are over. Going to Cineleisure definitely beats driving to KL and paying crazy high parking fees, getting stuck in traffic or taking an LRT.