What is the Best amp for Martin Logan

I would like to know what amps and pre/amp do you guys recomend to run martin logan home theater,front are ascent,theater center channel,aeon surround and will get a set of scrpts for back sorround.right now I have a B&K AMP MODEL 7270.I really like to know what is better than B&K for the same price?or maybe a little more money?

regards,Armando