Re: ATC 200s
I guess the market varies from place to place. I live in Phoenix, and ATC's sell like hotcakes here. I bought a nice 200s for my wife last spring. Not quite stock (has an aftermarket monoshock rear suspension, axle extenders, alum rims and holeshot tires) in exc condition for $800. Look at traderonline.com to price them (asking prices!) in your region. $900 sounds a tad steep, but again, depends on what they bring in your area. Down here you can't touch a 250R for less than $1,500, if it's at all decent. As far as reliable, her 200 will start in one or two pulls, no choke, even after sitting for weeks and weeks.
Hope this helps.