Champion/Rogue. Hate them, but yeah, they're pretty OP. Tanking, DPSing, and uber AoE's all in 1.
AND they can hit you for 190k through any amount of walls in siege QQ.
Lol, did I contribute to your C/R hatred there Noblewarrior? Pretty sure I killed you in siege quite a few times. >.<
For what it's worth the big hit through walls sounds like Elemental Rampage from Champ/Mage, not C/R at all. The AEs for C/R are either centered on the player with about 75 range, or targeted out away from player but more for the movement slow than damage. They also require a lot of rage and have cooldowns of at least 1 min.
The tank options were mostly listed already: Wd/W, Wd/D, K/S, K/P, K/R, K/W, C/R. Warrior/Knight is possible to tank lesser things and you have high dmg output. C/P, C/M, C/W might be ok too, but I haven't actually seen anyone do well with them yet (Champ was introduced more recently, so could work fine and I wouldn't know yet).
Rhale - ValhallaGuild - Artemis