How much does power amplifier really matter comparing to other hi-fi components?


What is the best ratio (out of a total of 100%) in terms of money to put in a high-end hi-fi set containing:
1. CD player/DAC, 2. Pre-amp, 3. Power-amp, 4. speakers.
(25% will be assigned to each if the 4 parts are equal).
Can we take this as a reference to distribute the budget when buying power-amp?

Looking forward to learning experiences and technical information from audiophiles including hi-fi dealers.
cclee2022
I think the biggest flaw in assigning a budget % to each piece of the audio chain is that it doesn't take future changes/upgrades into account.  Here's how I would approach building a systems based on my limited experience.

First, try to figure out what a realistic goal is for your system.  When I purchased my Focal 836v speakers I had the opportunity to listen to nearly everything in the Focal lineup from the $500 bookshelf speakers to the Grande Utopia EM speakers.  I never considered that a $30,000 speaker, for example was a realistic option for me and ended up selecting the 836v that was the most expensive speaker that I could afford.  I have always liked the Focal sound and have never regretted my purchase.

My speakers were initially paired with the SACD player (still use) and Onkyo receiver that I already had.  I almost immediately upgraded the receiver with an Integra receiver (the goal was to still be able to do home theater) and I still have this receiver in my home theater setup.

I eventually added a stereo amplifier and have had several different ones.  My current Pathos Classic One MkIII (with vintage Mullard tubes) seems to be my "forever" amplifier.

I recently did an op amp upgrade on my DAC which gave me some perspective on how significant the role of a quality source is.  I have a little bit of pro audio experience and know that gain structure is important and in a practical sense means that any flaws in the signal just get more amplifier at each step in the system.  If your source produces a noisy signal then your preamplifier and amplifier can only amplify the signal they are given and a quality speaker will expose it.

The issue with starting at the source is that the speakers plays the most significant role in the final sound of your system, so if you don't like the characteristic sound of your speakers I don't think a perfect source will change your mind.

I would recommend investing in a speaker that you love and is expected to be capable of achieving the sonic quality that you desire.  I had the opportunity to listen to my chosen speakers in the main room that was setup for the Grande Utopia EM speakers, so was able to evaluate what they were capable of.

I was also able to listen to the $500 bookshelf speakers on the same system and even though they sounded pretty amazing, I could tell that I would want more than they could provide.  

It's a journey.
@limomangus - If you're not willing to give 120% or more then you're not trying :-)
After reading through what others have posted, I wanted to follow up with the numbers from my system.  I've never really looked at them from a % perspective.

1. Source (20%)
    Bluesound Node 2i
    Maverick Audio TubeMagic D2 DAC
    Sparkos Labs upgraded discrete op amps for DAC - high value
    Western Electric Vintage tube for DAC
    Pioneer Elite PD-D6-J SACD player

2. & 3. Amplification (39%)
    Pathos Classic One MkIII
    Mullard Vintage tubes for amplifier - high value

4. Speakers (38%)
    Focal Chorus 836v

5. Cables and Power (3%)
    Blue Jeans 10 AWG speaker cables
    Blue Jeans Coaxial Digital
    Blue Jeans Stereo Audio (3x)
    APC H10

Total $8,000
I wasn't too worried about the amp as long as it was quality built and powerful...but the Benchmark AHB2 changed the game for me. It made a very noticeable difference in my music.