SO I was wondering, is 110 dollar/BTC expensive in the states? What is the average rate on 1 bitcoin in USA?
Depends on who you ask.
Many people are unaware of the disparity between MtGox and the other exchanges, so with just a bit of effort it isn't very difficult to find people willing to pay MtGox based rates (between $115 and $125 at the moment). Some people are more aware of market conditions, and will only pay BitStamp, BTC-E, or CampBX based prices (between $97 and $107 at the moment).