Moving away from inefficient/low impedance speaker in order to move to a Tube Amp

I think this is talked about more on the amplifier side...tubes to solid state or vice versa. But as we all know, going with a  tube amp requires some effort in choosing the proper speaker. I have Harbeth C7's, which are a very nice speaker....but I'm not willing to spend the money on a high quality 100 watt tube amp. For those that have been in this scenario, please share some additional steps from your journey. Example 1: You had speaker A, but surprisingly found it worked fine with tubes...Example 2: You had speaker A, but it did not sing with tubes, so you found speaker B, and paired it with Tube amp C..... Cheers -Don