The Maxx in particular is one of my favorites. It was the only 90s-era Image series that didn't wallow so heavily in the excesses that made the 90s awful, and is pretty cool on its own. Zero Girl and Batman: Secrets are also great, though short, reads.
There's a Lobo mini-mini (two issues?) coming out first week in November he does art on, though it'll be a bit pricey (6.99 per ish, I think, but they're like 80 pages each).
Also, on the topic of wild artists, DC also has Bill Sienkiewicz, who's prolly the closest to Kieth in style as comic artists go (especially since they're both pretty paint-heavy in their best works).