Check the new ONIX A-120 MkII... 120 WPC into 8 Ohms... I had one driving my 4 Ohm 88 dB efficient speakers until recently when I decided to try a few more powerful amps being driven directly from my CDP which has integrated volume control...
The A-120 MkII has excellent tonal balance, better bass control and presence than the McCormack DNA-1 Deluxe that I replaced it with, and in terms of PRAT you're only going to be as limited as your source with this piece.
I'm still in the hunt for other amps, a newer McCormack, some new digital amps, etc... but I think in the end it looks like I'll be back with an A-120 MkII and probably just having it modded to get the last bit of performance out of it.
Brand new they're $695, and for upwards of double the money I've yet to find something that beats it even on the used market... and I've been trying very very hard!
There's a 30-day money back policy on it as well, so if you don't like it... which I'd be surprised by... you can send it back and be out only the shipping.
Cheers!
-Nathan