I've tried a number of amps with the Super V's and never found them to be harsh/bright on the top end, in fact the opposite - having used Salk HT3's in the past I find the Super V tweeter not to be as resolving or having as much openness. Neither is perfect - the Super V tweeter sounds more realistic, the ribbon tweeter in the HT3 sounds more artificial and harsher/brighter than the Super V tweeter...both have their strengths and weaknesses. I still have the HT3's in a second system but find myself preferring the Super V system as, to me, it's musically more coherent and fun to listen to.
The SET amp I used in the past, and deeply regret selling, was a Vaughn Carina. I've used a Music Reference RM10, still have it, and currently using a pair of DAC Maraschino's. As a recovered Audiphool I no longer get involved with swapping out components to do an A-B, I just stick something in and live with it for a few months to see if I can live with it. I've settled on the Maraschino's so they must sound okay, they're also great value. It should be fun trying out the Atmosphere's.
I'm using 2 DAC's - Chord 2QUTE and the DAC DAC, both sound very good.