i want it mainly for iphone/ipad dev, secondarily for normal entertainment, and some design stuff (probably not 3d), currently i can afford the 13", so should i get it ? (would probably hook to a 1080p display when at home) or wait till next year and get the retina mbp ? (no need to use another display) . i don't really go out much so portability isn't really much of issue. and i don't really have to get this year, i just want, not need.