Assasin Secondary

I'm making an assasin as soon as I get GWF but I'm not sure what by secondary will be. Whad secondary profession works well with assasin primary?

A/W with some tactics is good, gives you a bit more durability, and it's useful for me because I've spent so long using a weapon/tactics warrior.
On the other hand, if you want to really lay the burn into casters, A/Me will be right up your street.