Pass XA100.8 or X260.8

Hey guys,

Trying to plan out my next upgrades and I am stuck between these two Pass models, XA100.8 or X260.8.  XA is a used set but the X260 would be new.

Current set up:
B&W 805D2
JL Sub
Aurender N10
Berkeley Alpha 2 DAC and driving Amps
Quicksilver Mono 120/KT150's

Future plans might include an upgrade to a full range set up like Magico A5 or maybe B&W 802.  

With my current set up I would just find an XA60. but with my thought I might upgrade later I am trying to buy once for the foreseeable future.  Does anyone have any practical insight?

Thanks