Could use some help with a tough match

Thank you Unsound. Excellent post, you have helped me crystalize my way forward. I will leave the Thresholds unbalanced because frankly I firmly believe they match up well with my speakers so will look for a single ended ARC, Sonic Frontiers or c-j preamp but welcome other suggestions. I looked at the ARC 3 but once again would be paying for technology ( balanced operations) I won't use. Any recommendations on a good ARC, Sonic Frontiers, or c-j models? I don't mind if its a few years old but I really want a quality unit. It will be the heart of my system so a class A component is essential ( quiet, big soundstage and dynamics ). I will start researching again but if anyone has a slam dunk recommendation I would appreciate your input.
Thanks,
Don

Don, if you are looking for a great single-ended preamp, I suggest that you do some research on this Shindo Monbrisson. They are a rare find on the used market.

FWIW, I have no connection with the seller.

Cheers,
John

I have use a few different preamps from Space Tech Labs http://www.space-tech-lab.com/ with S series Threshold and Fote #4 + #6 amps with very good results. Custom built to match the rest of your gear.