If it's 5 hours away and in good, ready to ride condition, and you can see proof of it running and going through the gears, I'd say <$2000 would be worth the drive to go get it.
If its 5 hours away, runs but definitely needs some maintenance like tires/chain/etc, <$1500 might be worth it.
If its 5 hours away, runs, needs maintenance, has a salvage/rebuilt title, and you want a track-specific bike with not much resale value, $1000 would be a decent price.
If you want a nice-ish street bike with little headaches for a decent deal, you'll be able to find something closer.