Turtles in Time is only going to cost you $10 on XBLA. If this doesn't immediately get your panties wet (and it should, regardless of gender) let me explain. Turtles in Time is awesome. Perhaps I'm relying a bit too much on the assumption that everyone experienced its practically indescribable wonderfulness 16 years ago, but that's all that really needs to be said.
The core game is a perfect representation of the beat 'em genre, and Re-Shelled is a great example of a remake done right.