go with a 2000 or 2001. I know all 2001's have climate control and 18"s. I think that there were still a few 2000's that came with 16"s and not too sure about the climate control. But I think that those are the only differences besides the 2001 Ironman edition having stock Sony Xplod speakers. You should just get one with the lowest miles there really isn't much of a difference.
2001 Ironman Daily Driver... 3.5" suspension lift (OME912 springs and 1" spring spacer), ball joint flip, 1.5" front diff. drop, 33"x12.5 TrXus MT, 16x10 Eagle Alloy rims, Interceptor, PV muffler, K&N air filter, Alpine Supercharger, Bilstein shocks, and some trimming.
2000 Ironman Project LS-1 VX... very slow progress but someday....... ohhhhh someday......