May be too late to help but here goes........
Things I would also be looking for are;
1/ Leaking forks,
2/ Wheel bearings...the combination of off roading and power washing after can tend to ruin them,
3/ Usual chain and sprockets,
4/ Damaged rims, spokes missing, rims bent...don't have to do a big mileage just heavy use,
5/ May be worth looking at the airfilter, give you an idea of how well its getting maintained,
6/ Check side stand for cracks if you can, they are the strongest around.
Nice additions would be a clutch protector, prevents a broken chain from destroying the clutch case, good tyres aren't so important imo, they aren't as pricey as road rubber.
I have an 03 bike, great machine and only one cylinder to worry about
Good luck