GMA Europa owners, what amps do you use?

Roy...for current Europa owners...are there any future upgrade paths that can be performed without the need for shipping? thanks...

Roy...thanks for the quick reply...for the moment...and probably well beyond...I am very content with my Europa purchase...every time someone hears the response is always the same:"where did you get those speakers!"...and this from folks who own Maggies,Vandies, and the like...I really dont want to monkey with the cabinet or crossover...so if there is every a time you could suggest a tweeter upgrade without the above mentioned hassles...let us Europa owners know...keep up the great work at GMA...just curious...what is the new price point for the Europas?

Roy...also...is the next version of Europas going to have larger mid/woofers, sealed or ported?, and more bass extension?