Although it is no longer in production, I bought a Joule VAMP integrated used. I have it on my Merlin VSMs now and I love it. I am partial to the Joule stuff as I have a VZN80. It is an absolute steal at the price you can get it for used. Don't let the fact that it is not in production fool you - production was not halted because of a lack of performance.
Jim
Jim