I would suggest Dgex, the site looks terrible, but the operator is trustful and you will get your Nxt quicker than with Crypsy. 
http://dgex.com/index.htm?2254 (ref. link)
http://dgex.com/index.htm?2254 (ref. link)
Ugliest site on the net.
Yes! Graviton is nostalgic for the 1990s.
