VFE Standout, Maxon ST9 Pro+, I like them both. The ST-9 pro+ has the mid enhance function which makes the mids, highs completely tweakable to what you want to hear. I bought the ST9 pro+ because of Killertones video and I was nicely surprised how well the ST9 pro + works with my Marshalls and of course it works great with Rectos. A friend of mine got an ST9Pro+ on my recommendation to boost his EVH Iconic and he says it works great on that amp, as he is a huge Cannibal Corpse fan.