I need a new laptop. I have owned a few MacBook Pros in my time. I'm wanting a 15 Retina, but don't have enough money right now. I will be do some light Photoshop and video editing. Should I buy an older 17" MBP, 15" MBP, or a cheap Windows PC to hold me over until around March 2015 (income tax ). I have around $700 to spend. I see 2009-2010 MBP on eBay for around this much. Thank you.