I just received my Citizen Gotham 1 in the mail this past Friday and it' been a great 20" wheel bike with the single speed. The terrain around here is mostly flat, but I have went over few small bridges and rolling hills without any problems at all.
Bike has been a joy to ride and it has been everywhere I take my other bikes so far. I have already finished 47.23 miles on mine in the last 3 days and it's been a great purchase in my opinion.

They did just raise the price though to $289 was lucky to get mine at $269...still a fine price for a fine bike in my opinion though.

I think you and anyone else would do fine with it....not a fast bike, but you can get going pretty good with ease and not tire quickly even after a few miles of pushing it.

http://www.citizenbike.com/catalog.a...&product_id=31