Hey guys, I'm trying to build up my Dreamcast collection but I need help! My current list of games is -

Power Stone 1 & 2
Shenmue 1 & 2
Seaman
Jet Grind Radio
Crazy Taxi
Chu Chu Rocket
Worms Armageddon
Sega Smash Pack Vol 1.
Maken X
Elemental Gimmick Gear

I'm looking for some specific type of games though, and in need your help! The first type of game I'm looking for is a racer, but not just a standard one, one that's very arcade-style and is more like Burnout than Gran Turismo. I was also wondering if their were any combat arena games, such as Twisted Metal?

My next genre is sports, but again, rather than simulation, something more arcadey (more NBA Jam than NBA Live).

And last but not least is schmups! I know one I really want (Mars Matrix) but I can only find US copies going for over $100. Anyone have any cheaper schmup recommendations, or even help me get a cheaper copy of Mars Matrix? (I'm in Australia, so my options are pretty much limited to ebay, I doubt any of my local stores would have anything).

Thank you very much!