I would add something different and proven, that already has services like XPM (PrimeCoin), I'd stay away from coins that are new and unproven.
K.
Just to back-up my post:
Cryptsy has trading pairs BTC, LTC and XPM.
XPM is listed on almost all major exchanges.
XPM has services and games, a large user base and strong community.
XPM is unique and doesn't conflict with coins already listed.
XPM is established and has a proven track record
If CryptoAve was to list the latest coins it would have to list more than just one. I think getting the exchange established with the coins that ARE used will make it a success.
K.