Warrior Advice
There is no tanking in this game.
http://wiki.guildwars2.com/wiki/Aggro
Are you planning on PvE or WvW? A lot depends on what you will spend most of your time doing, and whether you run around solo or in groups. It looks like you want to be tanky, so you will probably want to focus on a support/utility role. This is much better suited to groups, just to let you know. You mention doing open world stuff, which can still involve groups of people (whether they are grouped with you or not). I run a tank build and love it. I mostly run in WvW with groups of people.
A little more detail would help us to answer your questions better.
80 Warrior – Akallos Traitine
www.ConstantWarfare.com
www.ConstantWarfare.com