@sbank
I started with the speakers and then, at the end, had to replace the amp. If I had started with the amp, I would have had a much better way to tell which speaker worked best for me. The range of the amp-with-speaker choices is wider than either the speaker or amp range, besides the fact there is no such thing as speaker or amp sound "alone".
When I switched amps, the change in speaker sound was just as varied as when I switched speakers (in similar price range) with the same amp. That's what my ears told me.
I was thinking of metaphores before my original post, and they were all flawed, just like yours. tires as the amp? Seriously? Don't you see how ridiculous it is.
At the end, there are arguments for either approach. The bottom line is, you can't test speakers without a decent amplifier and one that matches your needs. It will be a flawed experience.