so I i need a machine asap. i have nothing right now. i was suprised to learn no apple stores have the 4gb model. rather than wait 1 week+ should i just buy instore tommrow? my uses will includes itunes, mail, safari , 1080p + 720p mkv's in vlc, external 27" monitor, occansial unraring of 5gb files, data transfer, basic final cut express editing. No heavy media work. So am I ok with 2gb?