Yeah, exploring more Wu Tang wouldn't go amiss, although Ghostface is basically the one for loopy lyrics. If you want other solo albums, maybe give GZA's 'Liquid Swords' a go? I like that and Method Man's 'Tical'.
Heh, have you heard much Kool Keith? He's really, really overrated, but I think his rapping-absolute-nonsense schtick came together pretty well on the original Dr Octagon album. He's on about being a gynaecologist from Jupiter, so you have to be up for a bit of filth, but it's all such nonsense I think it'd be hard for most to get offended. Even some of the skits are good, which is a bit scary.

"There's a horse in the hospital!"
I'm always a bit hesitant to recommend this guy, but I do love him... just depends how wonky you want to get... a UK MC called Infinite Livez. His album 'Bush Meat' is really funny, IMO, in a pretty dark way. It has the most repellant innuendo this side of
My Humps, but unlike that it's inventive and funny.
The Adventures of the Lactating Man is pretty clearly titled,
White Wee-Wee is as well... have to skip that when I'm in the wrong mood ... other raps include one about pawning elephant shit as contemporary art in Soho galleries (great line about "MCs in formaldehyde", eat your heart about Damien Hirst); one about a centaur pikcing up a My Little Pony in a bar ("Babe, I just wanna let you know / You're the best looking thing to come out of Hasbro [...] You're such a cutie / Big yellow star tattooed on your booty"); and another about a woman following her husband, sure he's having an affair, and finding he's banging an ape. It's really demented, but it's pretty up mood-wise, lots of reggae inflected vocalising (like all the best UK stuff, I reckon) and I prefer it to a lot of the more serious dudes. I mean, Aesop Rock's lyrics really are as good as all that, but a track like
Daylight is enough for me.
I also think Mike Ladd has had some moments of greatness. See if you can find 'Welcome To The Afterfuture'. It's stood up to 8 years of listening so far with me.
Edit: One more - have you heard any of the MCs affiliated with Freestyle Fellowship or Project Blowed? Some of that's quite amazing given it was going on in the early 90s. At least as far-reaching, adventurous and virtuosic as things like Anticon, but just less of the liberal art college vibe, more stoner / jazz nerds. I don't really think any of the albums come together that well, but there's some incredible moments amongst it all. Maybe you've heard Prefuse 73 if you like sanctioned-for-indie-fans stuff like RJD2? One of the Fellowship's key members, Mikah 9, does a version of
Life & Death on Prefuse's first album. Aceyalone is the most famous of all of them... oh wait, he did a whole album with RJD2... so you probably heard that? Can't believe RJD2 did a song with Ric Ocasek...