How much would a holiday to U.S.A cost from U.K on average and where to go?

Basically I was planning on going to usa in around a month but after all research every seems a nice place so I was wondering if I could have some recommendations and how much on average you think it may cost me all in all, assuming I was staying in a cheap hotel. Please don't mention Las Vegas, that is somewhere I'd hate to go but I have had herd more that good things about connicut?