I'm basically going to pick up a used / refurbished laptop to use strictly for design work on the go. I have a Mid-2011 iMac 27" and would like something that wouldn't be too much of a departure from that. The dilemma is: should I get a 2007 Macbook Pro 17" and risk it being too slow to run InDesign, Photoshop, etc. on OS X Mavericks with its max of 4gb RAM. Or, should I get a 2009 model with a smaller screen, but with higher max ram of 8gb and more support for future os updates down the road? The big screen would be great to have, but I don't want to buy something that I can't install anything on, obviously. Are the 17" MB Pros made in 2007 still worth buying used, or no?