I don't own YG speakers but if they like power 70watts may still not be enough, That said I like my Prima Luna Prologue 5 a power amp a great deal. using GL KT 77s which make fewer watts than the stock KT88s One of the good thing in the Prima Luna line is the flexibility of the power tubes.
Primaluna or Rogers for YG Acoustics Carmels
I just bought a pair of YG Carmels and have been running them with an Octive Audio V40SE using a small REL sub. The YG's like tubes as do I. Classical music only. My Octave Audio is a little underpowered for these speakers from what I can gather. The Rogers 100 integrated is 65 watts of pure class A. The Primaluna Dialogue HP is 70 watts AB. I normally use EL34 tubes. Classical music only. The YG's are 8ohm 87db speakers. Which of these two amps ( or you may have a better suggestion) will best fill my needs. I need to stay within $5000. Thanks, Lance