PREAMP suggestions

Well here I am again pondering a BAT tube model to pair with the VK-600 I purchased and am absolutely thrilled with the sound of. Currently running 20ft XLR runs and really would like to go fully balanced. I cant remember where I read it but someone once stated running a amp like mine from a single ended preamp is like bridgestone tires on a ferrari.LOL

While I don't need it tomorrow I've also thought about snagging up a used TL7.5 Any thoughts?