Pass X-250.8, X-250.5 or XA-30.8...or?


Hi.
I am looking for an amp to drive my Revel Ultima Salon 2's.

I have always loved Pass designs, owning a few of his great amps in the past.

I don't think the 30.8 will drive my Revels. And I'm hearing that there is a noticeable increase in sonic performance between the .5 and .8 amps.
I will be using a Krell EVO-202 as the pre.

Would love to hear your thoughts and observations.
I need a reliable amp as I live in Hawaii and shipping stuff to get it repaired gets really costly! 

Aloha!

mauidj
Im using Pass 350.8 most of the time its running in class a wonderful stage,bass definition,stage and great highs etc. Great I'm running Magico Q3 speakers which need lots of power.Enjoy!!
Many thanks for the input.
It's a fairly large space.......hexagonal with 18' long walls so I'm reading that you all think a 350 would be a better choice.
I would like monos but it's not really practical in my situation.
Is there a lot of difference between the .5 and .8 series?
Probably going to buy used or demos.

for me, the X250.8 was a significant upgrade from the X250.5      Same for a friend who did the same upgrade