I personally think a 1500 is perfect for those Wolvs. If anything, go to a 2000. I think anything above that is overkill. Not saying you'd have problems with a 2500, but I think there wouldn't be much of an advantage to it.
Any of these should work out for ya..
http://www.ebay.com/sch/i.html?_nkw=wolverine+350+axle+bearings&_sacat=0&_odkw=04+wolverine+350+axle&_osacat=0&_from=R40...
Welcome to WC, glad to have ya!
Congrats on the purchase! Im willing to bet youll like it a lot more than the Polaris. I still think the older 350 Wolvs are the best sport-utes ever made!