Mmmm, adding another cab then makes it a less manageable/transportable bundle. The 2x10 cab is 20kg which is really quite heavy already so adding another cab just increases the PITA factor, no matter how good it sounds. Added to that here in Australia it's A$3500 for the D800 and the 2X10 which is like US$2700 or UK2100, put another 2x10 in the mix and you're looking at a A$5000+ setup. That's beginning to sound like serious money. I dipped out a Markbass because I couldn't hear A$1000 difference between it and the rig I've got now. I can hear the difference with the Mesa but is there A$2000+ difference. Not to mention the additional weight.