Just use BTC or satoshi (0.00000001) like in:
I just bought a car for 10 BTC!
The new Final Fantasy game will cost only 15000 satoshi!
Using mBTC, uBTC, μBTC is just unnecessary, sounds like a different coin and it will confuse a lot of people.
Coinedup and a few other sites are guilty of using mBTC.
1 satoshi is the smallest unit of BTC that's all people should have to learn. If you want massive user adoption you have to simplify things.
With satoshi being such a small unit I prefer bits being added as well. I agree that mBTC and Ubtc etc. are a little confusing.