I used mintpal & cryptsy.

People complained about cryptsy, why?  i dont know. always great support on tickets etc.
Mintpal i don't trust anymore.   I think they will have a attack or something just because people got mad because of the delay.

Got a few buys on cex.io, Really looks good!
Can't say a thing about there support with problems or so.

Lazycoins.com looks good, easy to use,   just no volume.