The Xavix Bowling bundle should be the first one you pick up. It's my favorite game for the system. It doesn't have the quality of motion sensing like the Wii does, though. It's got some sensors on the console and the cartridge has a few more on it, and it basically picks up on the reflective nature of the bowling ball. You can actually play the game with the boxing gloves that come with the Jackie Chan Boxing game, too. It's an interesting little system by a bunch of ex-Nintendo folks, from the middling days of the last generation. Plus, the peripherals like the bowling ball, boxing gloves, etc. all would look nice on a shelf in a game collection library.
Anyhoo, I went to a Movie Trading Company location today and bought a complete Alien Storm for the Genesis for $2.99, a Parker Brothers game for the Atari 2600 with the label peeled off for $1.99 (nearly always a Frogger cart, but it's always fun to find out what it is) and a Playstation ASCII Grip one-handed controller for $3.99. I bought this thing and while driving home it made me wonder why the Japanese would design a one-handed controller, and then I thought about all the T-and-A type games released in Japan... ewwwww. If I ever use this thing, I'll make sure to clean it off with Clorox antibacterial wipes.