Hello all. Apologies for the slightly long post. **Background** I bought a Full HD video camcorder about 6 months ago and I love the crispness of the final footage! But I'm finding my early-2007 Macbook (2.16GHz, 2GB RAM) underpowered for using iMovie 09. I'm using 1080P video converted from MTS to Apple's iMovie format (I forget the name), editing on an HDTV (32", 1080P), with my media on a 1TB MyBook connected via Firewire 400. My main issue is that iMovie gives me the spinning beach ball every few minutes for about 20-30s even when just scrobbling the source video. On the fly playback is also choppy, though once rendered and exported the final video is fine. It's not a horrible experience but well, it's bothering me enough to want to ask for your advice on the forum here **$64k Question** Is it worth me upgrading to a new MBP? I'd be getting the 15" or the 17". Or to put it another way, is the difference that Firewire 800, dedicated GPU, and more RAM make to the iMovie experience significant enough to justify upgrading? Thanks for any/all advice!