Other than OEM shocks being expensive (new are about $600 each) or a good motocross shop can rebuild the OEMs (about $900 for the set here in the Denver area). Most suspension parts are still available, but you may have to wait for some of them to come over from Japan. Isuzuparts.com has worked well for me in the past.
Some common issues are ABS not working (module can be rebuilt), windows not working well (lots of fix ideas on the forum).
Several good write-ups on the timing belt change on the forum. If your fairly good with mechanics you can do this yourself if you have the time.
TOD should be fine as long as the CHECK light is not on and it functions well when you test drive it.
Live, Love, Forgive and Never Give Up