Obviously, jump, climb, balance, and tumble are necessities. I was thinking of playing an urban thief, a type of 'second story man' that escapes across roof-tops, so that would add open lock and disable device to the list. I also think that hide and move silently would be good.
I've been looking at the thief-acrobat prestige class from 'Song and Silence' as well, but am undecided if it's exactly what I want. I know I'll need good int and dex for the skills and also decent str for jump and climb.
Any good suggestions for this. With the group I play with, it can go from mostly colour to high-powered gaming, so I'm open to both suggestions.