Yup - changing out the head unit but keeping the Inifinity amp is easy. As far as the speakers, I changed mine out to Infinity Kappa 62.5 (with aimable tweeters). Installation was a snap and the sound difference was AMAZING. About $150 a pair. Next upgrade is a sub, but I'll use a separate amp for the sub. Any suggestions anyone?? I was thinking of going with the MTX Thunderform, custom fitted to my 96 JGC.