Matching surround speakers

Hello all. I have a really nice and high end front LR and center channel. For surround speakers, since it will be only effect and not going to use much, I want something economical but closely match the spec of the front 3 channels (Wilson Audio Alexia and Mezzo). Is there a way to match speaker by simply looking at their specification? I try to keep the 2 pairs of surround speaker under $5,000 OTD. Ideally tower. Any suggestion?