i'm looking for an inexpensive way to get a tube sound. currently playing an ibanez semi-hollow through a peavey sessionbass, and waiting on an avatar sb112. don't need huge volume. after searching tb, it's come down to 3 options. best tube option for the money? 1. tube pre amp (can't afford the U5!) 2. used tube head (would be low watt due to price range) 3. hybrid head w/tube pre (ex: hartke 2500) let's say $200-$300 is the ceiling for this one. what do you think?