I am selling my KHS urban exrpress. It's a Medium frame, bluish-silver, light and great for commuting. It is used but in great shape, both tires and the chain were recently replaced and it had a full tune-up; the only issue is that I recently realized that the seat doesn't go down, it might just need some oil...I am around 5'7 and it's good for me, so that should give you an idea if it would work for you.

Considering this seat thing, I am asking for $150, and can include a helmet and tire pump for another $10 each if you want them. Ignore the rack in the picture, it no longer has one. (The price for a new bike like this one is $619 -see price and specs here http://khsbicycles.com/bikes/2014-khs-models/xpress-14/).