New to DKs. Current Specs?

I might be the only person to not have a DK at least in the 70s so I think it's about time.

I have read some threads, I'm sorry if I've missed one, but I was wondering, What are the current prevailing thoughts on DK specs?
Do most people run all dps or 4 dps and a tank?
What specs are great/convient for boxers at time moment?

(ground targeted AoE is out of the question on slaves for me.)

Thanks for the responses.

If I were you I'd do a search for the info the forum here look for heroic UK with dk thread and you'll find a large portion of the info you need. That being said feel free to armory moocrewa on azgalor server and you'll see my blood/frost spec, that's the one I use on my 3 dps dks with my feral druid as a tank. The other spec is my raiding spec which can be used for a TON more dps for fights that need it. I personally only 4 box atm cuz I don't have a 5th at 80 and cuz I'd rather someone else heal :)

I'd say blood for leveling. I currently run my DPS DK as Unholy, purely for Ebon Plaguebringer for my 2 Elemental Shaman.

Thank you for the responses. I have since searched again and found some stuff I missed the first time.
By the way, 3 Blood DKs with a simple (probably not optimal) dps macro are tearing up Hellfire.

Thanks again.