MintPal? Poloniex?
cryptsy
No, craptsy it´s the coin killer.
no doubt they should have the crypt keeper for their logo with a computer spitting out zero's and stomping on a bitcoin. their eeviiill.
Bittrex is plenty good enough. The volume will suffer if the market gets split up, and in worst case you'll just en up with an enormous spread. Better to wait until volume picks up a bit more.