Pass Labs X 350.8 or 350.8?


I've a small listening area (about 220 square foot), and I'm using below equipments:

Esoteric K-03X CDP
Lumin S-1 Network player
ARC Ref 6 Pre-amp
Electrocompaniet AW-180 Mono-block amp
Wilson Audio Sophia 3 speaker ( In the future, maybe I will upgrade my speaker to Shasha 1/2)

I want to buy a new amp to replace my old EC AW-180 Mono amp, my choice is between Pass X-250.8 and X-350.8.    Should I get X-250.8 because of my small listening area?  Or I better to buy X-350.8 for long term? THX.
mmbl622
I would go with the 350.8 over the 350.8.  Why do you want to replace the Electrocompaniet?
My understanding is the the X250.8 is a little sweeter sounding, but the X350.8 will have more power to drive difficult speakers. You may want to look at the X260.8 monos as well. Higher Class A (34wpc vs 17wpc before hitting Class AB) output to start with and might be more to your liking.
Hi theothergreg

My Electrocompaniet amp is already 6 years old, I want to get some new sound , just like I replace my  Electrocompaniet EC-4.8 per-amp with ARC Ref 6.,  and the result is amazing.