What is your budget? What is the efficiency of your speakers, what is thier nominal impedence and what is their minimum impedence? Knowing this will make recommendations more meaningful.
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I have a Simaudio i.53SE. It is a fine and convenient integrated, but stepping to a Pass Labs class A will provide more dimension to the music. Your speakers are pretty efficient so, if stepping up, it may not be about more power, but better circuitry. If my speakers had those specs I'd go for the VAC 160i.
Depends on your budget. I used an NAD M3 with my Adagios and it sounded very good although was not strong on air and detail. The detail was there, but not forward. Very good bass, soundstage, not fatiguing at all. Very powerful, meaty, and substantial sounding with the Adagios. Plus, it had tone controls so you could turn up the treble if you wanted to but I never did. I only sold it because the display is small and I couldn't see the volume number from my chair. Dumb maybe, but whatever! Now I'm using a BAT VK300xSE with the Supertube option. Compared to the NAD it doesn't sound as powerful but does have more air, detail, (this sounds silly, but) "tube magic".
The NAD can be had used for around $1400.00. My next choice for SS would've been Sim I7 because it also has a large display like the BAT and twice the price like the BAT. Others to look at might be Plinius 9200, Cambridge 840A V2, Anthem, or the MF you mentioned. Then there's Class D like Wyred4Sound, etc but Class D didn't suit my preference. All comes down to synergy and preference but I think the Adagios like power. (disclaimer: I like power)
I have used and love the ATC SIA2-150. 150 watts where the first 15 are in class A and then moves into class A/B if more power is needed. The ATC has the rich full bodied sound of class A with the nuts of very well designed class A/B. I preferred it to many of the afore mentioned integrateds.
I suggest you listen to the Ayre AX-7e Integrated amplifier. See:
As posted above, I also suggest you listen to the Pass Labs INT-150 and the INT-30 amps. The Luxman L-550ax Class A amp should also be added to the list. Since you already own the Sim I5.3, you should listen to their newer models.
The real question to ask is how do you make a decision. The best case would be to listen to the amps in your system and then decide. If you cannot listen with your speakers, it is going to be difficult since you do not know how it will sound. It might be better to select an amplifier that you can listen to in your system instead of guessing what amplifier will sound the best to you.
Hopefully, the comments will point you in the right direction.
ah yes another fine amp the ayre...the modwright will be recieved within a week and we will know.having the amp in system is the only way...not to mention room anomolies.I appreciate everybodys suggestions,hard to go wrong with any of them.yes the luxman is another thats very tempting for me...ill keep posted,thanks.