I have a '01 Ford Explorer Sport and can't decide whether i should get the Polk MOMO 5x7/6x8 that are 10-80 RMS and respond from 40hz-25khz, or the Infinity Kappas that are 2-100 RMS, pivot tweeters and respond 40hz-21khz. The kappas sound like a better deal but im not sure. Ive heard Polk's stuff and have 2 of their 12's and love them but i have never heard Infinity, though i know their good have heard people rave about them. So let me know, thanks