At those prices, you're not hurting yourself with any of the three. If you decide to later get serious about tournament foosball, I would think the TS would be easier to sell.
I never cared for the brown top dynamo. It didn't play like a TS and didn't play like the classic dynamo. I think they were trying to appease the TS crowd that had just been abandoned.
The Shelti is probably the closest to playing like a Tornado, but it's slower.