Your welcome, any year and model of the Eiger is fine. The only change I'm aware of over the years was just the different plastic and new name when it became badged a KQ400, but it is still the same exact chassis as the Eiger. The latest change has been from carburetor to FI, and a digital dash instead of an analog speedometer.
Power wise they are in between the 350 rancher, and the 420 rancher, but closer to the 420. The new FI model will probably be darn close to the 420 engine wise because of the 4 valve ohc engine vs. the 420 having 2 valves and pushrods. The suspension and ride is actually better on the old Eiger, and current KQ400 than the new 420(I've ridden one before) which says allot about why they haven't changed that machine much over the years.
I had that same engine in a Dual Sport motorcycle, and it was bulletproof with zero issues and still ran and looked as new when I sold it with over 25,000 miles on it. They are also very maintenance friendly with the engine being in the frame in the regular way. It had 30hp in the bike version engine, but uncertain on the atv, but not really that important. I'm sure less as they are tuned different for more torque for the obvious reasons of weight. Good luck in your search, and if you do come across a mint rancher 350 it would still be a good buy also, they were the top selling utility of all time I believe. The 2wd version was a good machine also, and very capable if you found one.
05 Suzuki DR650, Mikuni TM40 flatslide pumper carb,JE 10.5:1 piston,stage 2#190 Webcam,open airbox, Twin Air,full FMF system,Pingel fuel valve,Ricor Racing rear shock, Ricor Racing fork Intiminators, Progressive springs, Sargeant seat,DRZ250 tailight,custom plate,LED's,GPS,sumo fender,PT bars,Cycra brushguards IMS lowered pegs, aluminum skid,bearing chain roller,Pirelli,tank bag(gone)
06 Zuk KQ700, Kenda Bearclaw HTR radials Warn RT25 w/ syn. line, 1.5mm clutch shims