Post by Noyomo
Pretty much any spec works, frost is the only one that might have some problems but that's mainly due to lack of obliterate till 61.
http://www.wowhead.com/?talent=jZZfMMI0fkTcq0cout is probably the base unholy, going 17 into blood after that, filling out Bladed armor, 2h spec, subversion, butchery and dark conviction.
http://www.wowhead.com/?talent=jfVMqI0IsbozZG0x0h is probably a decent one for blood, you would fill out blood till the 51 then, then go 7 into unholy.
Alternatively you could go
http://www.wowhead.com/?talent=jfVMqccIsfozzAo and fill out the othertrees, though with this build your oblite's eat your diseases till lvl 73 and you don't get death runes from them.
And finally, if you want to do frost,
http://www.wowhead.com/?talent=jZG0xtGxdRhoV0st would probably be a good base, going into blood for the same talents as unholy normally does. You can re-arrange some points if you want to do a DW build, but most DW builds are either a tri-spec or like 32/39 ish, going frost/unholy. Also, the 51 is totally unnecessary for frost.
Post by Evzal
I know this is past 65 but ive been testing alot. If u wanna grind then kick ass in pvp if some1 attacks u, Go with this build. Only thing ive died against is Durn the hungerer and 2 paladins at once :P ( Killed 1 and the rest got to 10%. both lvl 66 ) :D
http://www.wowhead.com/?talent=jfV0VZZfMMItrkMcoMfoz