I'm with the last two posters. With modern amps, sensitivity is wholly irrelevant.
Some speakers are very revealing, like ESL's or magnetic planars. Only a very clean amp will sound good with those speakers, but fortunately, these are not hard to find. Your ears will tell you immediately if the amp is the right fit for the speaker. Any dealer should be able to point you in the right direction.
Oh, and ignore specifications. As Jonas Miller (of M&K fame) used to say, "The best audio analyzers possible are your ears."
Some speakers are very revealing, like ESL's or magnetic planars. Only a very clean amp will sound good with those speakers, but fortunately, these are not hard to find. Your ears will tell you immediately if the amp is the right fit for the speaker. Any dealer should be able to point you in the right direction.
Oh, and ignore specifications. As Jonas Miller (of M&K fame) used to say, "The best audio analyzers possible are your ears."