Two Ladik A-520 (quad line->Eurorack boost) and two 3xMIA will get you six channels in 20hp for about $250. Add a third 3xMIA if you want all eight. But honestly I'd wait and see what you really need in practice, or get one A-520 (or an A-525, two in either direction) and one 3xMIA, both of which will have many other uses.