Yeah, I'm running 4 7950's in a separate rig I built. I don't think you'll get very far anywhere with 55kh/s... except DOGE was probably good for a short time. I mined like 200,000 DOGE overnight and traded it for like .2 BTC on cryptsy at it's peak.
The only reason I was paid .1 BTC and larger payments around that time was because middlecoin was mining DOGE and it was super profitable for a short period. Now I'm averaging .02 - .04 per day.
It's really easy to set up anyways, and you don't even have to sign up to a site. The username is just your wallet address and payouts go directly to that every night.