Best amp for KEF LS50

I've heard the LS50s a number of times. The first time was the best; it was at THE Show at Newport when they premiered. They were paired with Parasound separates that were approx $8-9k and a laptop for source. Very nice sound, but a lot of $$ for a $1,500 speaker. Then heard them with Parasound again, but an integrated (not the big one) and the sound was not near as good as with the separates. One thing I've heard over and over is the LS50s need lots of power. Too bad they don't have a more benign impedance curve.

I just purchased a used Pass Labs INT-30A integrated amp and will try it with my LS50s.  My only fear is the Pass Labs is a 30wpc Class A amplifier and my small home office where the LS50s reside could get hot!  Doesn’t help that it is summer and I live in Florida.  If it gets to hot int the home office I will try it in my main system.

I see I have commented on this thread in the past so I thought I would update.

1) Paraound A23 + LS50 : I thought this was good combo but easily bettered by the next 2 amps I bought.

2) Second best was Peachtree Nova 150 + LS50. Lot of details, not harsh. Can listen for hours. The iPhone USB connection is surprising good with iTunes. I normally listen to FLAC or FM radio.

3) The Benchmark AHB2 + LS50 is my best combo, Just clear and deep view into the music.

Still love my Rogue Cronus Magnum II with my LS50s, even more so after some careful tube rolling.