What I have: MBP Penryn 2.4 Ghz, 2 GB, 200 HD, Matte. What I'm looking at: Unibody 15" MBP 2.53 Ghz, 4 GB, 250 HD, Glossy. Love the new trackpads on the MBP, not sure how I'll like the glossy screen. Would be doing some video work down the road (Canon HV40). Please tell me the difference between the performance of these graphics cards and lastly which one you would opt for. Thanks.