Okay, about a year or so ago I decided to buy the original Xbox, basically the only reason I decided to do this was to play Knights of the Old Republic (it played like crap on my 360)
So I went on ebay and bought the very cool looking crystal version which was an absolute steal at £40 with 2 crystal controllers and the dvd remote, plus 2 games.

Anyways, after I'd played through KOTOR 3 or 4 times I did the same thing with KOTOR 2, and absolutely loved both of those games, but after that I kind of neglected the xbox and went back to the PS2 and 360 again. It's only recently that I've started to build my collection of the numerous great games that the original xbox has to offer, can't believe I've been missing out all this time.

So I was wondering if anyone could reccommend some good titles that will help me build up a respectable library for this amazing console. So far I have the following games:

Halo
Halo 2
Half Life 2
KOTOR
KOTOR 2
Ninja Gaiden Black
Project Gotham Racing 2
Chronicals Of Riddick
Fable

plus a couple of crappy games that came with the console (la rush and need for speed hot pursuit, though I doubt I'll ever consider actually playing these 2)
Obviously not that many at the moment, but with how cheap games are on ebay I'm sure I'll have a much bigger collection in no time, so what am I missing?

Get the Dead Or Alive games if you can find them, and check out Gamestop's website to see if you can score a used copy of Marvel Vs. Capcom 2. It probably will cost a minimum of $80 (the game is extremely rare) but it's worth it. Get an arcade stick for it too.

go to metacritic.com, go to the xbox section, and see the list of games in score order. This will tell you the best ones. For racing, I think Burnout: Revenge is the best racing game. And SSX 3 and SSX On Tour are tons of fun.

If You Get Any Hitman Game You Have To Play Them In This Order.
Hitman: 2 Silent Assassin
Hitman: Contracts
Hitman: Blood Money

And You Have To Get
Grand Theft Auto: San Andreas

I would say games like:

Morrowind (goty aswell)
Metal Gear 2 Substance
Oddworld: Munch's Oddysee (a true classic, xboxwise)
All the Splinter Cell's

Destroy All Humans 2

jet set radio future
Pro fishing challenge(dont know if you will like this,but its like the best fishing game ever made)
Brothers in Arms road to hill 30
red dead revolver(awesome music)
timesplitters 2
all the colin mcraes
the warriors