For servers, (I'm looking right now, it looks like they are all Medium except for:

Vox (EXC)(PVP) = Light... I have no idea what EXC really means, but it says it's an exchange server. :P
Venekor (RP)(PVP) = Light

Nagafen (PVP) = Heavy
Antonia Bayle (RP) = Heavy

For the group, what are you wanting to do? If PvP I will be the absolute worst person to ask.

But then again, I probably won't be the greatest person for PvE.
I have played a SK, Paladin and Guardian though. The SK was really fun, but I am used to the Paladin type of tanking in WoW.
So when I pull too many mobs, I get my butt handed to me. Paladin was pretty decent, but for the way I really wanted to play, the Guardian is what I went with.

Granted I'm still in the 20's, but I just pulled 2 groups of even con, Heroic mobs (6 total) and only had to heal once and never lost agro.
I'm finding the Guardian is giving me more time to learn what I should do when the $%*@ hits the fan. :thumbup:

After I learn the ropes a bit, I may bring up another team with an SK (really was fun/neat).