The Pine is pretty, but the whitewater is not especially high quality- I put in below the dam at about 600 (I think, it was about 10 years ago)& there was one IIIish rapid and another river-wide playwave, but that's all that stuck in my mind. It was cold, I remember, because I had to hike across snow to get to the river from where we parked.
Lightner is over next to the Red Lion in Dgo, not Bay Vegas. Lot of debris (branches, etc). I've only run the last section from below Wildcat to the Animas, and I can recall much of anything special- but we didn't have a lot of water & we had to walk around all the branches. If it was cleaned out, the run might have a better flow to it.
The Piedra has 900 at the guage- that would be a better option, even though you have to put in above Pagosa. The bottom section gets a creeky feel at low water, especially from the Eye through Lucifer's. Plus the Hot Springs will be exposed, so you can stop and warm up there. However, it will be freaking cold- bring a small stove so you can have a hot lunch at the Campground, that helps a lot. We started a small fire there the last time I did an early season run for the full 22 miles.