Amp to Add Dynamics & Detail to 'Polite' Speakers


I'm looking for an amp that excels in dynamics and detail - I'd like to impart some 'life' or 'zip' into speakers best characterized as a bit 'polite' sounding. Looking for nicely extended highs with slightly lean and tight upper-bass.

I'm taking a little hiatus from tubes, so solid state or class d amps only. I figure around 250 WPC into 4 ohms and around $3k new or used.

What else can be done to push a system in this direction - silver cables?

Thanks for any suggestions.
128x128srosenberg
The general presentation of switching amplifiers may be working against you (and I don't mean this in a derogatory way).

The switching amplifiers I've owned didn't like silver anything. Check out NuForce cables. When I upgraded my AC mains to shielded 20 amp dedicated there was a noticeable improvement.

Also, when I used tube preamplifiers in front of switching amps I found I was listening to the preamp lower the resolution and transparency and masking my speakers shortcomings. It took a substantial speaker upgrade before I realized this.

IMO, switching amplifiers are ruthlessly revealing and many blame the amplifiers rather than poor system synergy. Class D can be economical but it's simply not easy. This is why I still use nCores in my studio. I've returned to tube amplification in the main system. In both cases I've always used subwoofers.
Find yourself an Acoustat TNT200 and have it rebuilt by Roy Esposito at Sounds Like New in Florida. It'll cost about $1,500 total + shipping and you'll have an amp rivaling anything up to $20,000.00. Characteristics are over the top in what you're asking for with unrivaled bottom end.
What speakers are we talking about? Of course, my experience is very limited, but generally speaking I don't think that you can completely change the character of the speakers by going with a different amp.

Of course, if you speakers are being under driven, that may be a different matter entirely.

So, what speakers are you running?
You may not change their character but you may very well change/realize their potential.