A Suzuki King Quad 500 DOES have IRS and locking diff. But it is a lot more than the Sportsman.

I ended up with a King Quad 400 this year, but it was a very close call on the Sportsman series because they are great values.

 

go to ATVmag.com read the reveiws, I love mine loads of power, since this is your first ATV take the free rider saftey course it's free and Polaris will give you 100 bucks for gear. ride safe, ride smart, have fun!!

 

There are several GREAT quads around 500cc. BUT for the $$, the HO is tops.