Go with having the hide tanned, the uniqueness is in the WHOLE hide not just the head. I was lucky enough to get a Piebald three years ago and have the hide on my wall and it looks awesome!! These animals are truly in a class of thier own, I've only seen 2 in my whole hunting career.
The one I shot, I had gotten3 pics of on my trail cam. I decided to hunt this deer specifically, letting other deer go so I wouldn't spook the area. It took 9 days and 4 sightingsbefore I got her. It's one of my most memorable hunts ever!

Sb it all depends what the animal means to you, I would have a full mount down for the simple reason my chances of taking another one is slim to none. It's a beautiful deer, if you dont feel comfortable with the person mounting him wrap the hide up and freeze it until the right decision is made.

I like the sound of that, why not pack it into a freezer and wait until you can afford the full body. good thinking Q2.

Also maybe ask the taxidermist about payment plans?

Another vote for the full hide tanned here, because of the spotting all over it.