Hegel h300 or Krell S550i or Music Fidelity M6500i

Get the one with the most buttons and knobs or, conversely, the one with the least buttons and knobs. I think any new amp takes time to settle in (and you take time getting used to it) and unless you had all three for a long period of time you really can't predict the "fun factor," as that is too personal. Simply ignore the opinions of those who haven't heard the damn things and read the reviews...

Really appreciate you all the guys, I have oppo 105 and my speakers are Technics SB-A55.and also I have HSU VTF 15H sub.i want kind a kind of musical,rich, bright( no cheap brightness that creates fatigue), dynamic. I don't like dull and laid back sound.so integrated amp is good choice or I should go for the separates or I can use with oppo 105?.i am open for all the suggestions. thanks again and best wishes to all of you guys.

I'm not familiar with your speakers, but Technics really isn't known for producing great speakers as far as I know and these look like the typical 70s/80s Japanese low/mid-fi fare (i.e. cheap drivers in a cheap resonant box). I'd be looking to replace them first, then figure out which amp will best drive the new speakers. Sorry for being a bummer here, but spending some good dough on a good amp to drive these speakers is not something I would even consider. Then again, if these are somehow great speakers then I guess I'm just a snobby, arrogant ass. Best of luck.

Snobby, arrogant ass? Hardly!!! Now that the speakers have been identified and given the amp brands that the OP asked about, I'd have to say that you, Soix, get the Audiogon awards for both understatement and politeness!

If I read his post correctly, Soix doesn't know anything about the OP's loudspeaker, yet he still has an opinion about them.