Old Xbox games, recomendations pleaseFollow

A long time ago I got an Xbox. I got this Xbox for one purpose, and that was Morrowind. Fortunately, I also got two KOTOR games on the system as a bonus. Crazy you say? Well I got 300+ hours out of Morrowind on just the mage save file I did, and only quit because of one little plot wrinkle in one of the expansions (not bloodmoon, the other one) in which I locked myself out of some little sub-plot, so I'm happy with the dollars/time I got out of it.

Anyways,

Fast forward one generation of consoles. I'm getting more and more back into console games as the tight grip of FFXI loosens more each passing month. Friends quit, **** gets old, semester work, etc. I'm not quitting ffxi or anything, but I'm not logged in more than twice a week for most weeks. It's much easier for me to play MP3 for my 3 hours (or so) of downtime per day or Elite Beat Agents in between classes while I'm away from the dormitory, than to try to keep up with ffxi as I used to be.

I figure that by now, many original Xbox games are probably pretty damn cheap, and used also. I'm highly considering digging the thing out of mothballs and hooking it up for some hopefully cheap, but also good, entertainment that I missed while I was so hooked into ffxi during the system's prime, and maybe to bide the time until the Wii gets Fire Emblem and Brawl. It's certainly not the most memorable system for me, but I'm sure that it's got some good titles out there also.

It might help to know my specific genres of interest; basically, I'm highly attuned to RPGs, SPRGs, strategey (real time or turn based) adventure (or adventure rpgs), and receptive to other things upon suggestion. Basically I'm looking for recommendations. On my list so far are Fable, and Halo. I figure I might as well at least give Halo a try, and Fable (while I'm not expecting morrowind) got favorable reviews at least.

tl;dr just answer the question in the title

Srsly. Ninja Gaiden. Preferrably Ninja Gaiden Black.
If you haven't played this, you haven't played on an Xbox.

Knights of the Old Republic 1 & 2
Halo 1 & 2
Fable
Elder Scrolls: Morrowind
Jade Empire!!!!
Beyond Good & Evil
Indiana Jones and the Emperor's Tomb
Brute Force
Buffy the Vampire Slayer: Chaos Bleeds
Crimson Skies: High Road to Revenge
Delta Force: Black Hawk Down
Far Cry: Instincts
Hunter: The Reckoning
Hunter: The Reckoner Redeemer
Jedi Knight: Jedi Academy
Marc Ecko's Getting Up: Contents Under Pressure
Mech Assault
Mech Assault II: Lone Wolf
Dungeons and Dragons: Heroes

That's all I can think of.

Steel Battalion, although I don't expect you can still get your hands on that game due to the high collectors item factor. (It's a awesome Mech sim you have to play with a huge *** dashboard instead of the normal controller.)

Time Splitters: Future Perfect. This shooter has a hilarious single player (also playable at co-op) but the fun really starts with the offline multiplayer. No other game can beat ninja monkeys, clowns and pirates shooting each other up in a Chinese restaurant with fitting background music.

...damn

I guess I have to get it then.

I hate platform games, but I loved the Indiana Jones game. I thought it was fantastic. Alot of people didn't even bother trying Getting Up: Contents Under Pressure. It's an absolutely fantastic game. They have Talib Kweli voicing the main character. Also has a great soundtrack. The story is pretty well done also.

Shameless pharming, Kao. Shameless.

My guy ended up being a skinny powerhouse covered in nothing but scars and tattoos with a giant sword. Try not to get excited Paskil.