I had a pair of Europas at one time, and they really needed a subwoofer in my room. I paired them with a Rel Storm, which was ok, but it took a lot more doing to integrate the system than it has taken me with the Rel on other speakers (eg Totems). So, based on my results I'm not sure Rel is a good match (even though I think The Storm III is a fantastic sub and would recommend it with any other speaker).
It would seem to me that the optimal choice would be GMA's subwoofer (the Hammer?), but that's probably beyond your budget. Sorry I can't be more helpful . . .
It would seem to me that the optimal choice would be GMA's subwoofer (the Hammer?), but that's probably beyond your budget. Sorry I can't be more helpful . . .