Joe, I certaily see your dilemma. Especially in the current financial market. But if the sword isn't going anywhere soon, and you are doing it for yourself, you may be able to have it done for a reasonable fee. Or you could collect Fuchi/kashira, then a tsuba-, etc. (so the expense doesn't hit you all at once. And a Tsuba, and Furniture aren't going to lose value right.
I have a Tsuba that is silver and I love it. It Will be mounted on something- because it's too nice not to be.IMO
I was going to mount it on a custom contemporary wak, but have decided against it since that piece is not antique. and I will likely sell that piece at some point. So I will mount it on something I intend to keep.
I think it's Wak size.