IMHO, you should always purchase new, whenever possible. Therefore, the following would be my recommendation:

The Dawes Haymaker 1200 ~ $380
www.bikesdirect.com/products/dawes/hay1200xi.htm

Good Luck!

PS.

The bike will arrive 95% assembled already. You'll just have to make a few minor additions and adjustments.

www.bikesdirect.com/instructionhelp.htm
(Watch the video as many times as needed for correct assembly)