First off, a word of warning here... ArenaNet appears to have tweaked several of the armor types and most of the armor listings you see on the Net are outdated. From what I've gathered the stuff you see on the Net is based on the Beta testing and some of those armor types have been phased out. I've found this to be the case with certain Warrior (Knight's set), Elementalist (Adept's set... no longer present), and Mesmer (Regal set) armors which carry different attributes in the game from their listing on sites. (Monk sets are unchanged.)
Secondly, in regard to Warrior armor... if you're willing to forego a bit of style, I recommend 1) Platemail on the chest, 2) Gladiator's along the arms, legs, and feet, and 3) a Knight's helm. Why?
1) Platemail loses a bit of physical resistance but is a bit more elementally resistant. The biggest bain of warrior armor is lightning (many sites note that some warrior armor can be up to -60 vs. lightning), so this helps alleviate that a bit. You lose some to physical damage, but physical damage is rarely as potent as elemental damage anyway.
2) Gladiator armor, meanwhile, is extremely well balanced, as it provides both energy boosts AND +20 to physical attacks. Energy for a warrior is at a premium, and some might even argue that a Gladiator chest plate is a good call. Maybe so, although you lose some elemental resistance.
3) The Knight's helm is also +20 vs. physical, although some might opt for one of the other helms. This call is more flexible.
That's my two cents, for what it's worth.