All I can say is, that is a beautiful Avalon Pre ya got there. Those things have some of the most beautiful tones I've ever heard!
Yea it's definitely made a difference. I use it only for vocal recording.... I started out just using a m-audio MobilePre and a Samson C01 condensor ($69.99). But after a deal with an indie label they got me a bunch of new equipment so now I have the avalon & a Sterling Audio ST66 Condensor.