I currently have a late 2011 21.5" iMac base model 2.5Ghz i5 that I've increased the RAM to 8GB. I am passing it on to my 13 year old son and want to get a new MacBook Pro (15" most likely) and a 24" external monitor. I do a small amount of video editing, quite a lot of iPhoto and I use Handbrake to encode videos, probably several each week. I've tried to look at benchmarks of my current iMac comparing it to the new MacBook pros, but I can't seem to decipher it for my usage. I'd like the most bang for my buck and I'd consider a 13" if the much lower price didn't cost too much in performance. This machine is to last me about 3 years, and then will be passed on to my son again (lucky boy!). I'd really appreciate any advice and help anyone can pass on. I also have an iPhone 6+ and an iPad Air 2, but I really need a replacement for my iMac (perhaps a new iMac?) to be the main computer of the house. Thanks in advance.