From a dealer or owner? Does it have maintenance records? Timing belt/water pump done? Clean carfax? Check VIN tags on all body panels?
I know people have picked up 99-00 Limiteds for ~$8000, so keep an eye out for that. Also, check to see if there is a button to the left of the steering wheel that says "RR REAR DIFF". That's the rear locker, which is desireable.
But if it rides great, all of the above checks out, and you like it, then why not? The wheel corrosion is not a big issue. You can either buy other ones on craigslist or re-paint those. Pretty simple.