I am new at this... I am about to buy the new mbp 15" i7 500 hdd. In the past i have only had windows pc, and used movie maker (which is one of the most frusterating things I have ever done) to put together videos. I am a youth minister, so making cool videos could come in handy. I would like to do green screen as well as other effects, so should I buy fcp when I purchase my mbp or should I use iMovie until the new fop comes out ( if I even need it at all)? Btw how much does it normally cost to upgrade?