As you already know, in order for a currency to be effective, it has to be massively adopted and to do that we need cash flow.
In terms of exchanges, my preference would be Bittrex even though, without some minimum volume, they're very quick to delist. Sort of a catch 22 with those guys. Not to mention Bittrex seems to be the primary home of PnD type activity.
As for "massively adopted", you need far more than just exchanges. You're going to need to get some faucets out there, some things like dice games and then start out of the box (this community) thinking for other things. I've always felt that cryto would be a prefect match for ingame currency for some mass market type games. Think facebook type stuff.