The Upper Blue is a great run. Plenty of action in an oar rig. I ran it last year at around 1100 cfs and it was great. It can be run as low as 600-700 cfs but it's pretty bony at that level. Check https://www.mountainbuzz.com/forums/f...iver-9118.html
for more info.
As for the Lower Blue through Green Mtn. Canyon, it's nice, feels like you're out in the woods, the fishing is great and there are a few fun rapids. However, the put-in is a biatch.