There are lots of good ones. Numeron's entry this year is especially eye friendly AND it's super tough, so an LP would be fun. You could discuss strategy and such.
I'd nominate mine but it's pretty short, it takes several plays to be able to beat it, but too short for an LP. By design.
The reviews are up on the front page of roguetemple, so you can see how they are rated and see reviews of each one.
Jo