If you're going to upgrade your speakers I'd do that first, then find the amp that works best for them. If you buy an amp that works well with your 7Bs there's a good chance the synergy will not be as optimal with the new speakers and you'll find yourself back in the amp market yet again.
Failing that, I'd add the GamuT D200, McCormack DNA 500, and Clayton amps as potential candidates given your preferences.
Best of luck.
Failing that, I'd add the GamuT D200, McCormack DNA 500, and Clayton amps as potential candidates given your preferences.
Best of luck.