If you want a Thuringian, you are almost half way in price to a nice vintage stone. There are a couple, for sale on the bay, right now.

I would buy a known quantity like a bluegreen or yellow green vintage, rather than an unknown, with a proven lack of performance. I have 2 MST that I bought for cheap and several vintage Thuringians, they do not compare in performance.

Or just buy a 12k Super Stone for bullet proof performance, $86.