Also, as to Circle, Hissi is a mighty fine record. There's a few threads about good releases archived somewhere on HH. I don't have every release, but my 2p worth would be, in no particular order...
Prospekt, for insanely good metal repetiton
Alotus, for Mogwai-esqu ambient atmospheric guitar noodlings
Forest/ Miljard/Guillotine, for the out there strug out alt/kraut-folk side
Meronia, their debut for a bit of Loop style action
Zopalki, a little like Hissi (ditto Andexlt)
Taantumus, for a more post rock sound (ditto Fraten)
Raunio, sweet live album from Prospekt/Taantumus period
Telescope - great live album
Six Day Run, Six tracks in 6 days. Pretty good on the whole.
Stuff that's a bit Hmmm (50/50 good/bad)
Pori - Post rock jazz ensemble
Katapult, odd bit of cool repetition plus bad metal
Golem/Versillerto - More odd folk, emphasis on odd
Stuff I ain't so fond of...
Hollywood, bad heavy rock
Sunrise, bad metal
Panic, as above
Tulikoira, ditto
Leviatan - Falcon (ex Circle) almost hair metal