I've just recently found TrustDice, and I think it's a pretty neat online casino. There's a good variety of slots, which are my favorite, and they have many that I haven't seen elsewhere. You get a daily bonus for free play too. I like that you can play the slot games for free in demo mode before spending real money. They also seem to be very transparent, displaying the RTP and stats on the load page of the slots. Give it a try!