I can't comment on the Euro speaker costs.
I will say that the Onkyo might actually have enough power to get the speakers playing, but is it the right kind of power?? There are so many options these days for power amps it is hard to recommend just one, from my perspective. All I can say is don't underpower them, you will be doing yourself a diservice.
What kind of sound do you like? I understand the B and W sound is precise and clean . You may want to balance that with a relatively warm power chain. A Cary tubed pre (I love 6SN7 tubes) into either a large and expensive tube power amp AtmaSphere?Manley?VTL etc.etc. or just a very powerful amp like the Sanders Sound amps which are made for Planar speakers but are applicable for other types as well. Good luck on your purchase I think you did fine.
I will say that the Onkyo might actually have enough power to get the speakers playing, but is it the right kind of power?? There are so many options these days for power amps it is hard to recommend just one, from my perspective. All I can say is don't underpower them, you will be doing yourself a diservice.
What kind of sound do you like? I understand the B and W sound is precise and clean . You may want to balance that with a relatively warm power chain. A Cary tubed pre (I love 6SN7 tubes) into either a large and expensive tube power amp AtmaSphere?Manley?VTL etc.etc. or just a very powerful amp like the Sanders Sound amps which are made for Planar speakers but are applicable for other types as well. Good luck on your purchase I think you did fine.