currently, i am using a reciever as the pre-amp and a stereo power amplifier. my stereo sound is good but i want something better.i need advise which among my two plans would have a better result. 1)ill buy a dedicated stereo preamp instead of using the receiver or 2)ill buy another bridgeable stereo power amp and make my configuration a vertical bi-amped stereo set up.. which one would have a better improvement?