Goertz MI-2s worked well with my SF Power-2 and 5.3s. Bi-wire used should be near your $300.00 limit.
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Look for a used pair of Acoustic Zen Satoris--I'd take a single run of those over a double run of just about anything else for the same price. I'm using shotgun bi-wire Satoris with my 5.3s and the midrange absolutely came alive with this cable. I've tried hooking up a single run of Satoris, and while I prefer the double run the single gets you most of the way there, and you can always try jumpers. Best of luck.