I posted this over in the bg side of things, and sorry for cross-posting, but I just wanted to come over here as well and say that yesterday I won an iAmp 500 head on eBay. This will now run my two Wizzy cabs for what I think is absolutely the best doubling rig on the planet. Well ... okay, the best doubling rig I've come across, knowing that there are many setups I haven't tried. 
(Someone should make a DB smiley ... )
Cheers,
Liam
(Someone should make a DB smiley ... )
Cheers,
Liam