I have two questions regarding amps. Firstly I eventually want to upgrade to tyler speakers, and see Jolida's name attached to them quite a bit. I am wondering as it seems most of the models recommend at least 30 watts, should I stay away from the 1301 as it might not be enough power? Also, I am trying to figure the most cost effective way to improve the sound of my amp in the meantime, right now I am running a 70 watt Yamaha surround receiver with cambridge 640c and paradigm studio 20's. Would getting a quality preamp and only using the power section of the yamaha make a difference, or would I be better off starting from scratch? Any ideas appreciated.