Please consider that the XO.2 has a decent resale value, so moving to either the BAT, MW or Dude won't cost me much out of pocket once the XO.2 is sold.
Roor- When you gonna upgrade those speakers? I'd do that before anything else.
As far as the preamp goes. I've got a Modwright SWL 9.0 and absolutely love it with my Pass Labs amp. Mine is the model below the 36.5 you are considering. I enjoy the flexibility to roll tubes and the weight and body it adds is superb.
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