Good suggestions! +1 for Assassins:Black Meddle Pt. 1"-very cool stuff.
Speaking of Sigh and a bit off topic......I liked Sigh's 2012 release-Somniphobia-wierd and experimental, but pretty aewsome if you want something totally from left field-like a bizarre nightmare. If you haven't heard Sigh, reserach before you buy....it's hard to describe-but I'll try....black and deathish vocals/mostly black, NWOBHM 80 guitar sounds, movie soundtracks, carnavelesque sounds, proggy sensiblities with an almost cartoonish vibe. The first time you hear it, you will think it's a joke, a satire. For all I know, it may be.
If you have heard Arcturus, Stolen Babies and the very awesome Unexpect, you're in the right ball park.
Genre title: uh.....Avante Garde Extreme Metal? Weird Schiit for metal heads!
Somewhat of an acquired taste....but I get bored with the traditional fare and need to mix it up.
I love this kind of stange metal:
Well, they are Japanese...haha