Hi all, Apologies if this has been asked before. I've searched the forum but can't find the info I'm after. I'd like some advice on choosing between the low-end and mid-range 15" MacBook Pro's. I'm steadily getting into VJing (live video mixing) and animation/film production and was wondering if it's worth spending an extra £300 to get the MBP with 512MB of vid memory and a faster CPU. Any advice/thoughts much appreciated.