For $2500 or less what's the best amp out there?

I'm especially fond of Audio Research equipment. I have the AR LS16 preamp. My CD players are EAD Ultradisc 2000 and Cambridge Audio Azur 840. Speakers are Vandersteen 3A's. My amp at present is the Parasound A21.
do you want solid state or tube?

There is a lot of info on this topic if you search the threads which may be one reason nobody has posted yet.
I have 3A sigs and Quicksilver V-4 amps, I think it's a good match. I don't know how it matches up with the LS 16, but there must be many here who do!