I use both in my system. The P300 will offer more sonic impact. Check out the Cable Company and you can have an in home demo to decide for yourself. www.fatwyre.com
PsAudio P-3-- or UPC 200
Which one should have the most impact on improving my system? A little wary about how hot the 300 runs and the increase in electric bills. I would run my cd, dac, and pre amp off it. Have a 20amp dedicated line that either one would be plugged in to. Thanks.