Well there are many angoras out there you didn't say if are you looking for 100% or not or what you are knitting with it.
Classic Elite Lush is a blend very soft but sheds.
Elsebeth Lavold has one too and it does not have the shedding problems as Lush does, and I loved using it.
Jolie is another one and the angora content is much higher than the ones above, it is definitely a luxury angora.
Pure 100% from Valeria de Roma is like butter! You have probably seen those sweet baby booties made out of this stuff, or a yarn like it.