Hm... I'd say around $1,000, give or take a little. I'm in the midwest.
If the video is his sale video, I'd like to see him canter both ways. (I just re-read your post and saw the muddy ground part. I highly suggest getting canter clips at a later time to add to the video.) Take some nice conformation photos, each side, front and back, making sure to include his whole body in the photos and stand him on the most level ground you can find. Put the confo pics in place of the grazing ones, maybe keep one in of him wearing the santa hat to show how unflappable he is. But in general, the angle of the pics make his head seem big and his body very downhill. We don't want that.
You said that he doesn't like spurs, what exactly did he do when you used spurs on him? What about if you motivated him by smaking him on the butt with a whip? Does he ignore even that? By saying that a beginner can't ride him, does this mean you can put a ten-year-old on him and have them fan his sides with their legs and he still won't move? That could be a downer for his ad...
I would maybe cut out some of the at liberty clips. Mostly because a horse will always look great when they're running in the pasture and people will be more interested in seeing how he is undersaddle. Plus, you might scare off some people if they think he's going to race around in their pasture with his head in the air and not be able to catch him. :P I know he was probably just having a ton of fun with his friends, but I think your market will be for people somewhat new to horses wanting a fun, family pleasure/trail horse and they may not have a lot of experience with horses to know that much yet.
I'm sorry that he has to be sold.