The Grid Overcoat is one of the best melee bodies in game at the moment. It's competitive with DL if you keep sanction up. I use it on drg and mnk myself, and I know some people use it on bard when they aren't on ballad duty.

NQ Darksteel haub isn't worth the cost in my opinion, especially when you have the grid overcoat as an option. I probably wouldn't replace my overcoat with less than an HQ pie > crit atk double meld, but that's getting into prohibitively expensive territory for most players (myself included). If you aren't going with the overcoat or HQ darksteel haub, double melded cobalt haub is the next best option.

Regarding Jump, use it as often as you can. It's more damage and more tp. You can also start your next WS while still in the animation as well, so you aren't really losing anything. It will also let you evade some attacks as Leoheart said.

As for your head slot, I'd recommend considering the Grid Officer's Cap, especially if you go with the overcoat since you'll be maintaining sanction anyway. Both overcoat and cap also count toward the set bonus if you're planning to use the lieutenant's spear as well. Paragon's Crown is a popular choice, but I've never been a fan personally (and have been too lazy to finish leveling warrior lol). The crown is also free, so there's that too.