For me (favourite beer in brackets)
Grey Trees in Aberdare (Afghan Pale Ale)
Mantle in Aberteifi (Dark Heart
Pipes in Cardiff (Californian Pale)
Purple Moose / Bragdy MΕ΅s Piws in Porthmadog (Dark Side Of The Moose)
Honourable mention to Wye Valley who, despite brewing the lush Butty Bach are actually just the wrong side of the border π