OK I'm going to buy my first mac, a mac pro. I've been a lurker for a while & I've finally decided to take the plunge (Financially). My question is, do I loose that my by going with a 13" or is a 15" really that much better. I will use it mainly for work so it's going to be a daily carry. What do most carry? Will I miss out if I keep holding out for the new ones or do I look for a good deal now? Thanks for everyones help.