Just to close the loop on this - I picked up a 2006 Iron Horse Warrior Expert today, for $300. I might have paid a bit too much, but it is about as clean as a used bike can be and I'll get my money's worth out of it. 9 speed, with a 11/34 cassette.
Spec sheet from the 2006 catalog:
FRAME: TRAIL/XC HARDTAIL
FORK: MARZOCCHI MZ I LOCKDOWN, 100MM TRAVEL
SHIFTERS/RD: SRAM X.7 TRIGGER/X.7 RD
CRANK: FSA GAMMA MEGAEXO
BAR/STEM: TRUVATIV LE RISERBAR/TRUVATIV XR 5D STEM
BRAKES: AVID BB-5
WHEELS: WTB SX24, SHIMANO M475 REAR HUB, STAINLESS SPOKES
Some quick pics - the scratches on the crank arm are the only real blemishes I can find, and everything works perfectly: