Currently Stalker & Mass Effect are cheap on Steam, I'm planning on getting a quad-core iMac 27" and was thinking of dual booting into windows for a couple of games. So how would Mass Effect & Stalker run on that rig? I was thinking of picking them up while they're cheap, plus are they even good games? I've heard split opinions on them being good and some being rubbish. So what's your opinion o' mighty MacRumors?