I'm under the impression that if you're gonna shoot pills, then you definitly DON'T want to IM them. But, when you think about it, Rectal would prolly be a bit better than snorting, b/c it just sits there and gets absorbed, where as with snorting, the nose is constantly trying to flush out all that foreign material. As far as IV goes, I don't think that much compares to that. Oral? No contest. I don't know about subliqual, but with such a large amount of crap to deal with, as well as a fairly large amount of active (most subl preps are a couple of mg, at most), so you may not get as much mileage out of it as you would like. I would say go with rectal or nostril. But that's just me.