I love this site in general. SO many beautiful sock yarns. http://www.simplysockyarn.com/servlet/StoreFront
This has been my favorite to knit up ... http://www.simplysockyarn.com/servlet/Categories?category=SOCK+YARN%3AMiss+Babs,+Yummy+Sport ... I made my twin daughters some in frog princes. I can't vouch for how it wears though, because they are only 4 and don't understand how awesome they are, they just know they fell different. Fail. I need to make myself some ...
This stuff is so fun, but see comment on other thread ... so tiny! I don't want to spend a year knitting one pair of socks. It sells out a lot (as you can see - the link won't work) http://www.simplysockyarn.com/servlet/Categories?category=SOCK+YARN%3AString+Theory+Colorworks,+Continuum
Lorna's Laces is popular and I have a bit of it because I love their color combinations, but I'm not sure I've actually knit any of it.
Koigu is very nice too. http://www.purlsoho.com/purl/products/item/409 I've used it a few times, but never for myself. I always give the best away!