Magneplanar 3.7 - recommended preamp and amp

Do not know what your budget is...but if you are considering the Stratos you might consider the Emotiva XPA 1 mono blocks...
I am not saying they are better...but the work well with Mag 1.7's across the entire sound spectrum---especially on organ music...I do not know if they are comparable to Bryston or the John Curl designs Halos and j 1 mono blocks....But on well recorded music like Blue Note and the Mercury Presence series they are brilliant. They are also very cheap under $2000 Also Macormack gets good reviews.

I will second the Cary 500 MB recommendation; best and most powerful amps that I have found for my 3.6's. Going to keep them for my newly ordered 20.7's too! They are the closest thing to great tube amps that I have found, they double-down to 1,000 watts into the Maggies, never ever run out of power, put out loads of current, and drive my Maggies to the low 90 dbs in my 17.5 x 26 x 9 room without any stress or strain. Very highly recommended.

Watch for a good used pair of the 500's and then get a decent tube preamp; you will be set for a long time to come!

Bryston is a good bet

I'm hesitant to add this because it's at the high end of your budged, but people have been raving about the Sanders Magtech. I don't think I've ever seen so many glowing reviews. It's the one I would want to try.

If you still haven't made a decision, please contact me on a Parasound JC1/JC2 option.