I think Marshall Valvestes aren't too bad if you're on a tight budget. I've heard a few that weren't too bad as long as you spend time to dial them in. better than a S.S. amp IMO.
I found this quote on a forum through a google search...
"Sounds like a Mesa Mark III/IV combined with the grind of a 5150 and a Framus Cobra. Sounds JUST like a killswitch tone, which everyone is dying for."
I'm pretty interested in that tone. Sounds like a winner...