i prefer using white ones instead of the more rare ones that offer different bonuses for a simple reason: i need at least 4 of them. thats expensive allready without them being rare, nontheless being SMITHED rare items.
while id like to utilize some of the statbonuses that rare ones offer, i cannot get myself to use one of them because the cost of making them usable would overwhelm me.
theres also the issue with some rares giving max hp bonuses which is REALLY BAD unless you use 4 of them which is so expensive that you wont be able to get them untill a point where they are outdated again.
why do i need 4 ?
simple:
Heal IV x3 (if you are using Heal III or below 2 are sufficient) to be able to chaincast the spell)
Cure IV x2 (in my level range (44) 2 Cure IV will most likely fill the hp of whomever you are healing up and even if they arent fully healed by this, the incomming burst will be gone and you can go back to chaincasting Heal IV (if the incomming damage is still to much the player deserved to die for neither blocking nor starting to avoid further damage))
Invigorate x2 (one might suffice if you only play in carry partys)
Idatens Grace x1
Strike Boost x1
Healing IV x2 (if your party screws up the targeting system would screw you up quite badly if you tried to counteract incomming damage by constantly repositioning yourself and do all the healing manualy with Heal IV so Healing IV offers a VERY GOOD alternative to sustain the whole group, it will be helpful if you can get 3x Healing IV but usually if you are in need on constant casting of Healing, the group is doing something majorly wrong so you SHOULD be able to handle most stuff with only 2 Healings)
sanctuary IV or Energy Ball IV will help if you have skill slots open to heal yourself and prepare a place for people to come back and refresh themselfs when they are under to much pressure. of course you can also use the left over slots for additional buffs like extra strike boosts or unbreakable/magic shield.
note1: this setup is build to constantly be able to heal damage, even if the damage itself will not be happening. you can constantly cast Heal IV on your target once you ANTICIPATE that he could take damage. this playstyle will take alot of stress from both: the support and the healed person.
to be able to chaincast for prolonged times you will also need to build your character for that. this means you need a good chunk of wisdom and 3 or 4 idezumi magatama. the only time you would want to get rid of an idezumi magatama would be if you get your hand on a staff cooldown reduction magatama that does not lower your main stats (does one of those even exist yet?) or when a magatama gives you >WISDOM< so you can get a breakpoint that will give you similar manareduction to the idezumi (read: the wisdom bonus will need to put you either at the 80,90 or 100 threshhold.) naturally you will switch back to idezumi once the maga is not needed anymore for achieving the wisdom thresshold.
note2: this build may be subject to change with higher ranking spells. since i do not feel the need to switch to higher ranking spells yet, i may update this playstyle later on to adjust it to the bigger mana consumption if necessary
note3: i do not include ougis into my playstyle because i did not yet have them on my weapons and thus do not know how they interact. if i had to chose ougis i would propably go for rapid storm and extend heal. i see no point in using meditation because the mana regen is unnecessary for the supporter at this level region and the damage dealers tend to blast through there mana so fast that id rather slam additionaly high ranking invigorates into my setup.
keep in mind that i did not yet even see someone use extend heal yet and have no idea what it does. depending on what it does i may shift its priority below meditation but thats unlikely. i would appreciate it if someone could tell me what extend heal does and how its supposed to work.
personally i see no point in playing offensive staff because there are enough other weapons to fit that role ... like EVERY other weapon in the game actually. the only valid offensive staff skills i know of are chase blister and soulstrike for their debuffing capabilitys because they boost the damage of the people that are supposed to deal the damage. of course, for soloing thats a different story, but a true support is a group player.
TL;DR
using expensive weapons is not an option for a real support unless you are lucky enough to feel bad because you didnt try the lottery instead of gambling for weapons. seriously, you would be rich if you managed to get such a loadout under these odds.