pass labs x250.5 or plinius SA102 for summits

i have started a 2 channel set up from scratch with a pair of summits. iam looking at the passlabs x250,5 v/s a plinius sa102.i am unable to audition these amps so any opinions/advice from forum members will be greately appreciated.i would also apprecite any tube preamps that
would be synergistic with the amps and the summits.