Hey brian, check ebay for MB quart RCE or PCE series or even the Diamond Audio M661. those are a few more options in your price range. As for how they sound, I have no idea. but i'm in the same boat as you and I want to upgrade my infinity reference components.
If you are a person who listens really closely to thier music than yes. The perfects have a stronger presence in the mid-range, however they are just as bright as the kappas. My suggestion would be to look into the eclipse se8254 or the jl xr650csi. The eclipses are a little brighter than the jls, but the jls are smoother and blend nicely. They benift of the xrs is thier cross over, 5 tweeter settings along with 3 midbass settings. They only cross over I have seen that compares is the MB quart Q. Yet 1200 dollars apposed to 379. The Xrs have the beat. The eclipses and JLs are an exceptional speakers, and both will eat the perfects alive.