DC-10!
Snave has a head for sale right now in the Boogie Classifieds.
I have owned 2 Mark IV's, an A and a B.
The DC-10 is hands down, the closest I've ever come to a Mark IV, but it's cheaper and to me, it is incredibly easy to get the same tones reliably.
The Mark IV is an incredible amp, but I wanted to play, not to tweak knobs. I also hated the fact that it would sound different sometimes with the same settings, placement, room, band setup, etc.
I did a lengthy A/B test between the DC-10 and a Mark IV A.
Basically, to my ears, here is what I found:
DC-10 had warmer cleans, better reverb and no crappy R2 channel that I couldn't get to sound good unless I sacrificed my clean tones.
Mark IV had slightly smoother distortion and seemed overall a little tighter.
Since I love loud clean tones and am not willing to compromise them, I chose the DC. It was very close though and in the end, the simplicity and ease of use that the DC offered was the deciding factor.
The parametric EQ for the lead channel is also much more user friendly. On the Mark, the amp gets flubby when the gain is turned up and the bass is above 4. The manual even mentions this. The DC does not do this.
Plus, I never used the 'Pull' functions.