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.