What amp to improve upon a Sugden?

Current combo:

Rotel RCD971
Sugden A48B, modded with point to point wiring and larger caps etc
Epos es14 on their dedicated stands

The sugden puts out about 50wpc and does sound good with the es14s at moderate levels, but I somehow think the speakers could benefit a great deal with higher power. I do not, however, want to lose the magical midrange that seems to be a trait for both the sugden and the epos.

Further, i don't have the means to purchase megabuck gear; probably looking at a used integrated.

Initially i was thinking Exposure 2010s, but it's been suggested to me that this amp will not be a worthwhile change.

Looking for anyone with epos es14 experience chime in here.

Thanks!