which amp for multiamp

I'm in the process to redesign my system from Lowther to a four ways horn system.
For the bass I 'll use the amp I actually have and I like it very much: Bel 1001.
I ask you suggestion for the amp for the compression drivers mid-low, mid-high, high . They won't need much power but low dc offset.
I would like something not too expensive and too big but they should sound fast and realistic in the frequency range they have to play.
I can build from scratch but unable to design.