Michel,
I've got the TS2500 and like it lots. The wheel kit works OK, but if you're likely to be moving it around a lot I'd question the guys at Scheppach about whether or not the 4 wheel kit for the TS4000 would fit it, which is a lot better arrangement than the 2 wheel TS2500 set.
I saw the Jet Supersaw at Stoneleigh, and spent around 10 minutes looking at it with a couple of guys from Ireland. It looks a good saw to me, and I can't imagine I'd be disappointed with it compared to the Scheppach. It looked a fine machine and was setup reasonably well. The height of the sliding table must be adjustable I'm sure, it strikes me as being one of the obvious things that'll need setting up in situ.
There's also the Record cast-iron top saw and the Xcaliber that Scrit has seen for real. I think it's about time the magazines had a big group-test to cover the main runners in the 10"-12" tablesaw market around the £800-£1500 price. I saw the Kity and Scheppach before deciding on the TS2500 - the fence seemed better to me (fixes securely at one end and flexes very little along its length).
I was originally going to get one of the smaller saws (TS2000 or Kity 419) but after finding that they don't easily fold down their tables, I decided to spend the bigger bucks to get something I'll be happy with for a lot longer.
Good luck with your decision making!
I wonder if Andy King would care to share his thoughts on the merits of the various saws?
Cheers,
AG