If it were say Labor Days or Impossible Kid then fine, they're available but I haven't gotten them on vinyl yet so I would likely have picked either up because I stupidly signed up for 6 mo for the bonus records. But this is the basic starting point to get into Aesop and it couldn't be easier to find.
Those would be the top two considerations for me, personally. Nothing against the rest of his catalogue in any way shape, or form (he's one of my top emcees - I love 'em all!), but
Labor Days and
The Impossible Kid are both pretty pinnacle points at different ends of his career. Sure
Skelethon really brought forth the new flow, but the sudden emergence of personal introspection that came with
The Impossible Kid is an undeniable paradigm shift for him - and he rocked it well.
Hell,
Bushwick would have been a more inspired choice than
None Shall Pass, although very left-field and a bit daring since it's an instrumental film score. Or, as I mentioned in the past, finally reissuing
Music for Earthworms would have been a monumental coup. Otherwise his solo stuff is all, thankfully, very readily available.
Now Hail Mary Mallon or The Uncluded... those would also be some very daring and exciting choices!