Which one ? They all sound (and, more importantly, feel) different. Added to which, individual early MkIIs sound different from others of the same series, and you have to play a lot before finding the good ones. MkIIIs are a complete crapshoot in this respect - most aren't anywhere close to an ODS.Just buy a Mark series Mesa and be done.
I have had almost all of them up to MkIV - still do, in fact - and the only ones that I've kept specifically for their tangency to any kind of D-style are IIAs and early Coli IIBs: later Coli IIBs are generally more like IIC+s than anything else. And regardless of what anyone else has ever told you, unless you play with a very light touch, no Mk is ever going to sound like you think an ODS should sound.
Speaking for myself, I use these amps more for an SSS D-style than for any ODS kind of thing. That's what they're better at - hit them hard, and feel the uncompressed slam and bite.
On pedals, I like the Ethos and Van Weelden; but again, more for an SSS style.