I had a Randall Lynch Box RM100 with some pretty aggressive custom modules in it, and installed JJ 6L6's in it. It originally cost me $1200 used, and I invested another $1000 in tubes and modules, but could never quite achieve the high gain tone I was looking for. A friend told me about Peavey 5150's and 6505's and swore up and down that they were the best bang for the buck out there. For quite a while I shrugged his advise off as impossible. Then one day, needing a backup head but not having very much money I saw a Peavey 6505+ head on Ebay for $650 and decided to bite the bullet and take the risk. Within minutes of opening the box, I had re-designated it as my main head and ended up selling the Randall. For just plain sick high gain tone, I'd pit it against just about anything out there with the exception of maybe a Diezel VH4 or a Framus Cobra. My bassist who is a REAL tone monger ended up buying one for himself because I liked the tone so much. He couldn't believe how badass it sounded up against all kinds of high gain / high dollar heads, and I'm in full agreement.