Going sword here, since penetrating blow doesn't get augmented by strength and the elite is quite fierce with high strength.
12+1+4 Strength
11+1 Swordsmanship
Rest to Curses
Seeking Blade
Hamstring
Pure Strike
Savage Slash
Warrior's Endurance {E}
I Will Avenge You!!
Rend Enchantments / Weaken Armor
Plague Touch
Wth? IWAY OH NOES!!!

Well, this is definitely my random arena choice. But for serious team games, this is PROBABLY NOT what you'd like to run with. [lol]
No res sig? Your choice to bring res sig or rend/weaken armor. Since Random arena is just plain chaos for me, I just don't bring it. [if you're on my team, don't die ^_^]
I don't expect to be ressed either since I'm shouting IWAY in combination with Warrior's Endurance.
The 16% armor penetration works even better when you have a Zealous Sword Hilt which allows you to get back 4e. per swing I believe. No Elementalist can keep up with THAT kind of e. regen from what I can tell. [4e./second with IWAY = 12pips of regen, I'm sure nobody can hit that lol]
Depending on how ill prepared you're assuming your foes to be determines your curses.
Normally I bring Weaken Armor with this build simply since the Armor Penetration is so high that doing more damage never hurts anyone but your foe. Other times, It's Rend, damn cowards...
One other idea that came to mind was to use Barbs.
Aside from the standard anti-warrior shpeel like hexes and conditions / defensive stancing, can anyone think of a way to pump out more damage? [using W/X would help but I want to pump out as much as I can from War's Endur...]

edit: the str. based attacks like Protector's Strike, Power Strike, and Griffon's sweep REALLY look good at this point I think...