I use the one from Concrete. Works well, but doesn't have multiplayer, which isnt even worth having anyways. I had this on my WM devices, wouldn't get anything from RealDice again.
Is it a smart computer that you are playing? I had one of my Curve before I got my Storm, and it was stupid. You could anticipate what the computer would do, so it wasn't really fun.
Edit: It is $9.99, but looks like there is a free trial which I'm going to try. The description touts it as having the best A.I. on a poker game, so we'll see