Here's an idea.
If you have only ever played solid state amps go to a music store and play though one at a decent volume. Then plug into a tube amp and play for a while (choose a low watt one and crank it a little) then go back to the solid state amp.
If you were blown away by the tube amps reaction to your playing buy a Kemper. If you were underwhelmed and didn't care much for the difference then buy any of the other ones....
If you loved the solid state more than the tube then buy anything Line6 and save about £1300. (sorry couldn't resist)