Xbox Live Arcade - What are you playing?

So what games are you playing/ have on xbox live arcade?

I have Aegis Wing(free), Castlevania Symphony of the Night(must have), and demos for Contra, pac man and geometry wars but haven't decided to buy any yet.

Any surprise favorites on there? What do you like?

(Note: This is only bordering on being a game recommendation thread, it is for discussion of unique or fun xbox live arcade games)

I've got Ms. Pacman, Galaga, and SOtN. They're all pretty good.

Lumines LIVE
Ultimate MK 3
Geometry Wars
Castlevania: SOTW
Jetpac Refuelled
Marble Blast Ultra
TotemBall (useless since I don't have a cam)

I only really play Lumines and Jetpack, though.

One mine I have Castlevania, Teenage Mutant Ninja Tutles, Pac-Man, Galaga, Bejewled 2, Ageis Wing, Double Dragon, Street Fighter 2, and Ultimate Mortal Kombat 3. Of those I only really play Aegis Wing, Street Fighter 2 and TMNT.

I pretty much play anything that gives me a big chunk of Achievement points.

Hmm, i have quite a lot of demo's on it, trial version ive been playing the most lately is Soltrio Solitaire (its soothing XD)

So far i've bought: Boom Boom Rocket (very underrated) Castlevania (still need to finish it) Hexic HD (comes with xbox premium pack, and its quite fun) and a couple more i think, can't realy remember now..

My favorite Xbox Live Arcade game is Small Arms

What in everyone's experience were the best 400/800/800+ games? (In terms of price)

at the moment Aegis Wing of course, I mean its free and friken fun to play online with it. other than that Castlevania has taken up some of my time.