How important is the amp?

10-08-15: Inna
I would think that good conventional speakers should sound good with both transistor and tube and hybrid amp, just different.

Nah! I don't think so. I'm in agreement with Ralph here. if you look at the speaker impedance & phase plots you can tell whether the speaker was meant to be driven by s.s. or by tubes. Also, talking to the speaker manuf can reveal some important info such as what amps do they use when they "voice" their speaker. All this leads to the correct category of amplifier - tube or ss or hybrid, etc.
A speaker driven by the wrong sort of amp can sound terrible...

Mordante,
this is probably a biased view since I'm a big fan of Symphonic Line amps myself. I've had experience with the RG4 Mk3, RG1 & Kraft 300 amps. Symphonic Line amps are really very good & can drive most speakers. So, if it were me, I'd wait till the last minute to upgrade the La Musica amp.
having Said that a friend's friend got the Kraftwerk & found it to be a superb amp. I don't have knowledge of how the La Musica & Kraftwerk amps compare.

10-09-15: Danoroo
In the sense that an amplifier is a fundamental and necessary component to any audio system, they are important. As far as it's contribution to the quality of the sonic signature the system produces, provided it is functioning properly and is of adequate power to properly drive the speakers attached to it....not so important. I would think components' affect on sound quality ranks something like this:

sorry but i strongly disagree.
do not underestimate the amp-speaker electrical interface. many people here on Audiogon (& other places) have gotten themselves into loads of trouble both electrically & sonically by blowing this off.
The amp is a major part. You get this interface wrong & all your hard work for the components upstream is flushed down the toilet.

10-10-15: Nonoise
...... Having said that, the biggest distortion generator in the audio chain is the speaker. Hands down.

I agree Nonoise. I stated this in another thread not too long ago & was challenged by the fellow who makes the Lightspeed Attenuator preamp (the one that has optical coupling for signal propagation). He insisted that it was the preamp & that I would surprised it was the preamp hence his design effort to minimize the distortion from it. He pointed me to his white paper which was an OK read. I figured it would be a pissing match if I countered his argument.
In the end, I also agree speakers are the worst offenders but I learnt that not everyone agrees on this. This surprised me as it's so easy to hear the distortion thru speakers esp. if they are not time-coherent (which 99% in the market are not). Anyway, just a side comment FWIW.