A 50 is more versatile so I'd get it first. I've used 50s on crop for quite a time (first a 1.8, now the 1.4 in my sig) and for me it's the good focal length for portraits inside, and outside it's also very usable for full body or environmental shots (without having to shout instructions at models).
Yeah I'm realllllly leaning towards the 50. I think it'll be good for portraits, also for my 365 which I am starting back up in a week. A good all-around lens until I save up more moola for an 85...or who knows what else. :P

I'm sick of my kit lens. hahaha. 
