If you have no problem buying used, I would seek out a VAC Phi300. While they're not monoblocks, they do have separate power supplies and are bridgeable. They're 150watts per side, so are plenty powerful and will drive pretty much any speaker.
While they have a showroom price of around 20k, they do show up every now and then used for 8-10k.
Simply put, it is a great amp.
Jim