Why would anyone recommend dark elf for DK now? Other than a little stat boost, all of its benefits can be found in the champion trees. That's why people are calling for race changes, they gutted some of them with 1.6.
Dark Elf for Magicka
Imperial for Stam
Redguard is only good if you don't have Imperial, 10% max stam and 12% max health is too good to pass up for anything else. Stamina will probably be getting a nerf soon anyways, as it's blatantly OP as far as it's burst damage is concerned, but luckily Imperials can make decent Magicka DPS as well, due to not having to worry that much about health and being able to dump more stats into Magicka and still retain that high health pool.
I'd roll Imperial, Dunmer isn't bad, but it's no longer the FOTM race for sure.