Kronos Quartet Recommendations?

The Kronos Quartet is, IMO, one of the most eclectic and accomplished string ensembles of the last 100 years. I can't think of one recording they've done that was not of high performance standards (and most also have excellent audio quality), although I'd readily concede that not every release will appeal to every listener. Two of my personal favorites of theirs are:
1. "Pieces of Africa";
2. "Kronos Quartet Plays the Music of Bill Evans" (or wording close to that).

I'll second "Pieces of Africa!" Also their tango record w/ Astor Piazzola (sp?) is fun. You can't really go wrong.

they have an interesting album called "black angels" that includes a stirring rendition of shostakovitch's string quartet no. 8. as the title would suggest, it's a very dark album, but the playing is quite good.

Anyone know if these are on vinyl?

Thanks.