WAR/DRK works horribly. DRK and PLD both make horrible subs because their magical side is completely debunked by dropping an already relatively low magic pool. I suppose RDM/DRK or RDM/PLD would pass, but I don't suggest it. But you want to be a damage dealer anyways, so that's not important.

DRK/WAR, however, works well. But you have to unlock DRK before you can be one, so you'll have to get to L30 with that. I suggest you take WAR to L30 with a MNK sub then unlock DRK and go DRK/WAR to L60. After L60 most choose to go DRK/THF because with the brute force with the WAR sub it becomes difficult to balance hate.

If you want to be a damage dealer know that there are other options. There's always SAM, DRG, RNG, and MNK as the heavy melee damage dealers. There are a lot of horrible DRKs, so they have a bad reputation and it can make it hard to get a problem. It has to do with the fact that there's a bunch of complete and total newbs who want to be some badarse guy who can rip through anything so they choose DRK because it's so cool and evil.

As far as servers go, I believe Midgardsormr has the largest EoFF population. There's those of us from the Red Lotus (Omecle, Lionx, and myself) and Roogle as well to name a few. You're welcome to join us, but you might want to join your friend if only because you know him well.

That's all I've got to say on the matter. ^_^