I would lean for a STP Singray just for the fact that you could have a very solid 5-hit build by subbing /sam, it's 28 STP(15 from sub +13 from the polearm) meaning that you only need +32 STP in TP phase to cover the rest:
-Rose strap +4
-Hagneia stone +3
-Houyi's gorget +3
-Brutal earring +1
-Lancer's plackart+2 +10
-Tyrant's ring +4
-Rajas ring +5
-Goading belt +5
And that gives you +35 STP in TP phase and 23% haste with 3% haste legs, which is more then enough ;) Of course, there are a few adjustments to do for WSing, but with a multi-hit WS such as Drakesbane and Stardiver, shouldn't be that bad ^^
Like most DRG's, I don't see myself doing any Relic/Mythic/Empyrean polearms and for myself, OAT is not an option atm so I'l stick with this :)
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Drk, Bst, Nin, War, Drg, Sam, Mnk, Dnc, Smn, Rng, Thf, Blu 99
Cor 90, Rune 74, Blm 30, Geo 11
Kannagi(85)
Fulgurante OaT(99) 5-hit
Herja's Fork 5-hit
Ukonvasara 85! 0/75 Claws
Almace in progress 5/50 Helms 36/50 Skins 2/75 Horns
Armageddon in progress 32/50 Lanterns 16/75 Hearts