All the fotm dps combos cost more or less the same amount to gear. They are all relatively expensive. But there tend to be more melee dps than mage, so you will have harder time gearing a melee dps due to competing for stats and stuff with other people. m/w tend to be easier to gear, but the down side is that you need to tier,stat,drill,rune,plus 2 complete sets of gear, so the cost ends up being the same.
Out of the viable tank combo's k/w is probably the most expensive to gear. Ch/p tend to be a lot cheaper but you kind of need to know what you are doing if want to tank on ch/p. But most wd/w can tank in dps gear on bosses, they do need to put hp and pdef on for trashes.
As for healers...ehh all healers are cheap as hell to gear, as far as pve goes anyways.
And as far as buffer/debuffers go...ehh I don't really have an opinion on it, I always take my alts for that kind of stuff.
-Failed attempt of trying to put a picture in here cause I don't know how to-
ROM's one and only pure stam/pdef stated tank
REACHED 13.57M PDEF ON 29/09/2016, NO SIGIL, HAIDON, ZODIAC OR RELATIONSHIP BUFF.
Retired until mages are buffed or melee's are nerfed