I am a complete Mac noob and am going to finally make the switch from PC....having had the iPhone for years since its launch and now my entire music collection on iTunes, along with the smooth iOS it's made it a no brainer. Now obviously for the iPhone/iPad I know there is an App Store. I see now looking into Macs there is also a Mac App Store. I am curious are all the great recommended software and games mainly all purchased here? Are software/games recommended purchasing physically instead (as in actual discs)? Does a stock base 27" model even have enough power to run a game like COD4 smoothly? I'm not getting a Mac for GAMING but it'd be nice to run some games with no hiccups. I'm sorry for all the questions but I'm clueless on all this so any insight would be appreciated!