I need to replace my ancient 17" Powerbook. I spend a lot of time working on large spreadsheets and really need a big display. I know that the 15" Retina has more pixels, but I am almost 60 and I don't think that my old eyes can make good use of really high pixel density. I am trying to decide between a 15-inch 2.4GHz quad-core Intel Core i7 with Retina display (introduced Feb 2013) and a new-old-stock 17" MacBook Pro with 2.5GHz quad-core Intel Core i7, 750GB - 7200 rpm HD, and anti-glare display (introduced Oct 2011). The prices are about the same. One big concern I have about the 17" is that it may become incompatible with the latest software sooner. It was introduced 16 months earlier but both use quad-core Intel Core i7 processors. Any advice would be greatly appreciated.