I'm upgrading my MacBook Pro as it's past it's shelf life, 15" duo 2.93 8gb 512 graphics, as I need to do some mobile final cut editing using 1920 avi files. Mostly straight cuts - few transitions and simple effects. 3 layer of video max and 2 soundtracks. Max length 20 minutes. Some compressor in downtime for unused footage. Photoshop work a given, but even editing 200 mg scans has never been an issue. Since whatever I buy I also have to get a AJA XT IO whatever I'm wondering if I could save some cash and get a 13" I5 16gb ram and 256 Ssd. mobile and low power consumption. Do I need the i7 13"? The i5 looks more pushed than they bother to do the i7. Do I still need the 15" additional graphics card and the quad i7? It looks great on screen until the price hits me. Thanks for the thoughts in advance.