I've actually heard great things about the Rev series, but that was the only Pioneer coaxes that got good reviews....Like the other guy was asking, what EXACTLY do you not like?
Are the highs too much, too bright, harsh, laid back, what??
Same w/the mids...not enough midbass, no drum kick, exactly what's wrong?
As for the rears, 4 ways is probably too much. Depending on how everything's setup, those could be messing things up. Many prefer to leave out the rears for imaging/staging purposes but something like a decent 2 way in the rear would be sufficient I would imagine....That's what I'm running, primarily for rear fill (off the HU) and for rear passengers...
Also, you mentioned the HU/EQ settings...work with those or let us know where they are now. You may have some freqs overboosted or something....I know on my Pioneer HU, adjusting the Q and leaving the fancy EQ functions alone really helped my front stage....
Jeremy