My almost-favorite patchouli scent is Histoires
1740 Marquis de Sade in its original formulation. I know they have some patch scents, but this is still a patch scent to me, and I think it's the best.

This is the bottle style to look out for.
Some others I love are
Mazzolari Mazzolari and
Mazzolari Patchouli. Again, the one that is called Patchouli is great, but the original Mazzolari is patchouli with some pizzazz. If you are a devoted patchouli fan, this is the one house I insist you explore. All their scents seem to be from-patchouli-up, and they are all really sumptuous.

One that seems not to list patchouli (but is
totally a patch scent, I can assure you) is Bond's
Andy Warhol Silver Factory. It's a really wearable,
resinous patchouli (as opposed to a powder puff patchouli), and it's the kind I migrate to.

Another I love, if you think you might like a rich, sensual, Arabian-styled patchouli scent with oud, is Micallef's
Emir. It oozes sex-appeal. And I'd wear it, though it might be a 'tad' to the right of dead center on, say Luckyscent's masculo-femina-meter. So sexy!

If it's a
classic patchouli scent you seek, I also suggest:
Maitre's
Parfum de George Sand, which is what I imagine proto-chypres smelled like before the frabjous day Francois Coty made his fateful tweak: full-bodied patch-based florals with very little astringency. And it feels right.
The Party In Manhattan is another one -- that while a true chypre -- really feels like something from another era. And it's the earthy sort of patchouli note that can even feel 'sharp' that characterizes this one.

Finally, I'd like to sum up my mini-list (I could go on, and on... and on...) with what I consider the finest patchouli scent of all time. A perfectly unisex masterpiece.
Givenchy Gentlemen. In its original formulation (and that's the only one I'd consider), it is a honeyed, earthy, fey take on patchouli, with a sexy leather note and longevity you will not believe! To be sure you are getting an older vintage, look on ebay for bottles that the silver label completely wraps; the labels that fit on the front face point to the new stuff, which has no magic left.

This is the bottle-style to look out for!