Depends. If you want their more experimental side, by all means get White2. All of their albums are pretty different in presented ideas, however. The first full-length (00 Void) is the most consistent (4 long drone doom tracks). Flight Of The Behemoth begins with two drone doom cuts, continues with a shorter Merzbow-fucked (seriously!) cut, and on again with more Merzmixing on track 4. The last track is just weird (I don't really dig it but it's OK). White1 is pretty cool. The first track is almost a half an hour long and begins with spoken word by Julian Cope until collapsing into the usual droning state of the band. The 2nd track has a programmed drum track, sounding like a laid-back, sub-stoner-esque version of the band. The third track, if I remember correctly, is all synth a-la Burzum keyboard instrumentals but heavier and nowhere near as typically melodic.
White2 begins with the usual drone cut, HELL-O)))-WEEN (containing about 2 riffs), SEGUEING into a creepy, space-romping track appropriately titled bassAliens complete with extraterrestrial squeaks and beeps. The final track is hauntingly narrated drone with none other than Attila himself doing the narration. PH33R!
Black1 should be out sometime this year.
EDIT: Uh, before you listen to one track and write Sunn off as ridiculous or preposterous or some other similar word, TAKE THE TIME TO GET INTO THEM. I can't stress this enough for newcomers to this band. I can tell you stories of many people I know, Internet and otherwise (aka real live people!), who, after listening to Sunn and actually concentrating on the sound, have ended up not minding or actually ENJOYING what they do. I know Sunn isn't for everyone, but plz let's try to not write shit off as pointless after one listen, thanks.
EDIT #2: SEGUEING. SEGUEING. AGRFGHRFDIUGH.DF/G/F/H/.
ALL THESE YEARS I HAVE BEEN SPELLING IT PHONETICALLY DAMN MY FAILED KNOWLEDGE.
