In reply to Rhaegalex:
I wouldn't get 2 different lengths, it would seem too easy to mess up at some point.
I also wouldn't mix my half and sport ropes, as the sport rope really needs to be a bit thicker as it takes a lot of abuse. These thin sport ropes don't last very long.
I use 60s for everything, you be surprised how often you climb somewhere (or have to back off) and will be glad of the extra length.
Post edited at 22:22