Best Integrated Amp for Thiel CS 2.4 Speakers

I bought a pair of speakers 15 years ago and the Accurus DIA 100 amp I had started popping (and wasn't that great anyway).  I put the whole thing in storage. Now I want to buy a new (or demo) integrated amp.  I am not opposed to pre-amp but that makes it that much more challenging.  I am willing to spend about $4K plus cables.  I listen to the usual - 70's rock, lots of instrumental, trip hop.  I do need solid low  bass.  I barely used the speakers, I don't want to sell them.  Any suggestions?  Thanks.