I'm looking at purchasing either a new or refurbed 15 or 17 Macbook pro. One of its potential usages is for video editing. I have no experience doing this. I don't know what software I'll be using yet but basically I want to clip or splice HD (most likely 720P) video. My question is whether a refurbed base 15" Macbook Pro with the 6490 graphics ($1359) is sufficient or should I spring for either a new Macbook Pro with the 512M 6750 GPU ($1799) or a refurbed with 1G 6750 GPU ($1699). If I go for the 17", I'm assuming that a refurbed with the 1G 6750 GPU ($1949) wouldn't be noticably slower the a new one with the 6770 ($2499). I plan on ultimately doing an SSD using an Optibay. Are there any issues with any of the above computers that I should be aware of?