I have an aging MacBook Pro and I am interested in jumping on the Starcraft bandwagon after hearing about how great it is. However, I wasn't included in the beta test and haven't been able to find a demo or anything similar to see how it would run on my system, which is right on the borderline of the required specs. I don't want to buy it and waste $60 because the game is choppy or barely playable on my computer. Any suggestions?