hi guys. just wondering what your recommendation is for the new powBook 12" in terms of having "enough" RAM. i usually run 5 to 6 apps simultaneously, from Word, Excel, Mail, safari, iTunes, and often garageband etc. i downloaded America's Army recently and notice it's jumpy and slow to load. i also get a lot of lag times when switching between programs etc. so, for the budget minded consumer, how much RAM should i add? thanks!