First post! Haha.
Anyway, I'm surprised by some of the responses in here. To me, I have played many many places, and STL is the toughest to beat. I would think that the donk-to-good player ratio is very poor in comparison to Las Vegas, obviously, but also to numerous other places as well. I would rate Lumiere as the easiest but the drive is long for me.
Here is a page for Harrah's - it is the last place in STL I'd play a cash game now but it has the tournament schedule link.