I just order 3 pairs of these, they look to be good quality and aren't plain and dull, but are a lil'bit pricey at $15 a pair.
Mens Socks |Gifts | Striped - Vivarati.com
I've have a couple pairs of these for when I need plain black dress socks, they seem to be good quality but I don't wear them all that often. Decently priced for dress socks at $10 a pair.
Viccel Natural Quality