michaelbbbb: A lot of good posts here but boils down to Doo & Yam for RF 136 track sled on budget. Looks any Rev Renegade 04 & up would be a good sled for you & hand down to wife later. Forget 03 Rev had beavertail & not the best rev set up. Take a chance on doo rings & crank & 5000 miles seems to be burndown ballpark milage average so look for low miles. I would faver 800 engine more power to move that 136 track.
06 Yamaha Attack GT very nice RF sled with 150HP 4s stroke engine with under 5000 miles would be an excellent purchase for both you & wife. Only thing you would need to check or fix would be exhaust donuts every 5000 miles or so. Attack also has more relaxed RF position than rev.
Check both sleds for good tracks, shocks & wheels & you can install hyfax & carbides if needed. Doo & Yam both have bullet proof clutches but spin the track to check.
Doo Rev is in next Generation RF congiguration with XP but rev was a good handling sled too bad the engines had problems.
Yam still current with Attack RF congiguration & will hold its' value better than rev but more expensive than older rev but Attack more sled with EC ohlin on the fly suspension ajustment.
Sit on Rev & sit on Attack & see which feels better to you. I prefer Attack because I don't like having my knees jamed behind me.
I think you will spend $5000 or so for 06 cherry Attack GT & about the same for 06/07 Doo 800 X Renegade. Doo X package shocks = to Yam Attack clicker shocks. Only compare Doo X package shocks to Yam GYTR shocks with EC ohlin as both top of the line & what allows us old guys to beat rough trails.
Hopefully this helps sort things out but spend a little more now & stay with the sled as you planned. Also make sure you hand down the best sled you can to the wife so she can have a good time riding with you. Wife not happy you won't be happy either.