used bogner shiva
the VHT deliverance is a great and much cheaper option as well
don't think they can handle EL34's without some small modding, though
or you could look for an already modded JCM or JMP
you can find a lot of modded marshalls for cheap on craigslist
modded amps priceranges only follow the forum trends, so you'll find a lot of NOW unknown modders
I bought a rebuilt '73 JMP 50w for $1000 with 2 extra tubes, tube buffered loop and extra gain stages
PTP board is stock, but it was fully rebuilt
I have no idea who did it
the amp was around Los Angeles, California (I'm in Brazil), and most people told me it looked like a Morin or Lee Jackson amp, but they denied the paternity
it's very bass heavy, but it's a killer amp
more of a Soundgarden/Sleep/Corrosion of Conformity tone than the Jose Arredondo voiced 80's hard rock sound most "famous" guys do today (Cameron, Fortin, Friedman, FJA)
I'm having it slightly tweaked to cut some of the excessive low end