I'm getting about 375 MH/s with my 7870 right now, but haven't looked into overclocking it yet.
After trying to find an exchange to trade my Euros to BTC, almost wiring money to BTC-24, and narrowly avoiding this mess with their accounts being closed/ website down/ lack of communication, I decided that I would try acquire my first taste of bitcoins another way. Luckily I went with a Radeon graphics card rather than a Nvidea when putting together my PC a while ago. I'm getting about 375 MH/s with my 7870 right now, but haven't looked into overclocking it yet. I'm sure I can do better than that. I've pulled in about 0.004BCT from mining for the past two days, noting substantial yet. If the ASIC miners don't come on line any time soon raping up the difficulty, I should have 1BTC to my name in the next 50 days.