The opinions here are great, but the prices are all over the map.
I have a Parasound A21 which sounds great and is what I can afford.
I heard a Musical Fidelity M6 500I integrated amp a few years back
and it sounded glorious for around $5K.
I might want to get a get a pair of Pass XS 300 amps and XP 10 preamp, but I would have to sell my house, cars and wife.