I have the Polks, and I REALLY like em. I have them paired to a 400W Clarion Amp, each is getting 100, and the volume and clarity is really nice. Definitly would reccomend.
From working with all of them we have found, surprisingly the Tantrums to be by far the best. However Looks wise the Polks and new Kicker KS's take that round.
For pure clean sound the tantrums win hands down.
Whats your priority? The Kickers may present the best compromise for you