DKs are in a good spot right now.
Frost is top right now, with DW and 2h so close that it doesn't matter which you choose. Unholy is not that far behind either and with the quality of life buffs that are supposedly in 5.2 I see a lot of optimistic Unholy DKs.
If you want a fast-paced spec, you'll find that in Frost. Either one is non-stop, DW actually is a little faster because you use 4 GCDs on Howling Blast instead of 2 GCDs with Obliterate, so despite Mastery stacking you have just
more buttons to press.
I love Frost, right now I am 2h, because DW felt
too fast, and because of weapon drops. My DPS is top in the guild, probably until our mage switches back from Fire to Arcane, and I won't ever give up my DK.
Here's a guide, if you have excessive downtime as Frost, you're doing it wrong, so just read up on how to play. --
http://www.icy-veins.com/frost-death...-pve-dps-guide