It all comes down to 4 vs 8 gigs of ram. The only app I see myself using heavily is Garageband (I'm an amateur musician), coupled with a bit of iMovie. I don't see myself upgrading to Logic, so will 8 gigs still be a "necessity", or a "no brainer?" I intend to do some casual gaming too, like Counter-Strike Source, and other mid 2000's valve games, that's it. I plan on upgrading in 2-3 years anyway.