As mentioned, the Kings are a good option. For some, those are simply too spendy though. If that's you, take a look at the stuff from White Industries. Easily just as durable as the Kings, but a bit more budget oriented.
If you cant afford a new king, I wouldnt really hesitate to buy a used king. Its not the kinda part that can really be hammered to death used (of course anything is possible, but those things hold up).
Ive seen complete king hub sets go for 300-350, or complete wheels go for not much more.
I really like my Stan's 3.30 hub. Much cheaper than King, and has held up to some abusive riding quite well. That being said, I upgraded from Specialized stock hubs that I blew up twice in a series of two months, so I wasn't exactly riding the best quality stuff before.