Hey, I'm 5'9" too and really struggle with lengths. It's the reason I run in cropped leggings instead of full ones. I've given up trying to find them long enough! I've ordered a size 14. I'm a 12, but I much prefer things to be too loose than too tight. Comfort in paramount in this game!
Anyway, I'm hoping for sub-60 on Sunday (it's the Swithland 10k - local to me). I know I'm capable and have done it in training runs, I just need to be careful to pace myself from the start and not get carried away. I've joined the local running club and they're loaning me a team vest to run in, which is actually quite exciting!! After that I have my 10k Race for Life in July and then I've gone and entered the Leicester Half Marathon in October... ARGH!!! Need to get my ass in gear for that one.
I think a 10k in July would be perfect for you because it's a while until your next one - go for it and don't worry about who else is racing. Just try to beat your own time
Edited: 03/06/2009 at 22:50