See if you can find a Vox Cooltron Big Ben - very nice transparent valve drive and stacks very well with an LTD in front. Not tons of drive but very natural and responsive - a real sleeper pedal. The BK Butler Tube Drive is probably one of the best, but is difficult to get and horribly expensive when you do find one. The Radial stuff is pretty flexible, but tend to go for R1,500-ish s/h.
Trubore wrote
Sometimes I plug in the LTD for some metal fun...
??? You obviously have a different idea of heavy metal than most. ? Unless you are also cranking the output to kick the amp into driving a lot harder too.
Oh... wait... a minute... are you talking about a Barber LTD
pedal or an LTD
guitar?