If its got no graphics, its gotta be an IQ Shift. Great sled. Powerful, nice suspension, reliable and pretty inexpensive for what you are getting.
IMO it might be a bit much for a 12 year old kid though. If it were me, if I knew he was going to be riding the sled, Id go with a 550 Shift.
Going from a '91 Indy 500 (about 80 hp) to an '09 IQ Shift 600 HO (about 120 hp) is a pretty big jump in terms of performance and that might be a bit more power than you want a kid to have. A 550 Shift would be very similar to an Indy 500 in terms of performance. The 550 would have slightly less horsepower, but it would be lighter; so the performance should be very close.
Each kid is different though and Im sure there are some 12 year olds out there who could ride any sled and be just fine.
When you say Wisconsin, you said it all.
'01 Polaris Indy 600 XC SP EDGE XR
Powermadd articulating bar riser with 2" riser block (total rise of 4 1/2")
red Cobra low sno-x windshield
Pure Polaris handguards with Pure Polaris mounts
almond/blue drive clutch spring with 10-60 weights
121" x 15" x .91" track with 96 studs.
Citgo Sea and Snow oil