It's a good thing gil isn't an object. Building even a mediocre WAR from the AH is quite expensive. Kitty pants are currently quite important for a WAR. It is possible that they will become less important when the expansions/new level cap come out. You may want to buy a pair from a sky linkshell or you may want to wait and see what the update brings.
You will need several sets of gear. Mine aren't optimal by any means. like you, for the most part i'm an AH war, so my sets may be especially helpful.
I'll post my sets
Engaged
Only thing you can't get from AH here is Kitty Pants. Since gil isn't an object, I'd suggest Oily Trousers instead.
Augs on Erlking's are DMG +6 Attack +6, Poison +3
I strongly suggest getting a kheten. any damage boost you can get(3-6) brings it close to perdu, and it's very cheap. Some augment combinations are even debatably better than perdu.
Idle
This set isn't that nessecary. Evasion is the wrong stat to boost for a war idle set. I should really use a set of darksteel armor for -PDT here. I made this set when i didn't know how bad WAR evasion was and I've been too lazy to change it. Jelly ring is an easy nm and worth getting. Orochi is very nice for idle regen. Hermes' Sandals are WORTH IT, probably best AH purchase i've made for my WAR.
Raging Rush
Replace Kitty Pants with Oily. Virtuso belt is an easy camp and well worth getting. Rutter Sabatons are also very easy and should be on any non-endgame WAR's to-do list. I probably have too much accuracy and not enough STR/attk/dex on this set. Veggettos and Raenryongs, i welcome corrections.
Enmity Actions
Not vital but nice to have. for true ah, replace any IR or askar on here with the Adaman equivalent, which still gives a nice enmity boost.
Solo Engaged
Evasion/acc/haste
slight compromise on assault earring, too good a piece to let go. Bloody bolts are important to have here
Solo RR is the same as normal rr except Fire Bomblet is replaced with Staurobow
I have KJ and SC sets but i don't think you will be needing those for a while. I strongly recommend spellcast, pm me if you would like my xml.
A solo set is nice to have, though the best solo set is [Job Change].
War's don't tank much anymore, so i wouldn't worry about that too much. If you do tank, i recommend /nin and haste for shadow recast as opposed to -PDT or DEF gear.
If you are /nin, you need 5 sTP for a 7 hit build on a 504 delay weapon. Since you don't have rajas, i suggest eating carbonara to get the sTP and 7-hit.
If you are /sam, you need 22 stp for a 6-hit build. You get 15 from /sam. I suggest carbonara/rajas + rose strap, which you get from campaign.
another possibility is ecphoria+chiv+carbonara/rajas
i'm quite sleepy and sure i missed stuffs. pm me if you need clarification