If you are going to Penta-meld you pretty much can achieve max DPS stat. Aka Main Stat + Vit + Crit + Determination + abit of Skillspeed/CastSpeed. How you meld is well depending on what stat you weight heavier or which Materia that will weight heavier on your pocket. So long as it fits the criteria of no having an equip level above 40 you're good to wear them.

And no twink is complete if you haven't get the Ilvl 43 weapon. The differences of that 10% WPN DMG is enormous, not to mention most main pieces of armor grant your +1 Main stat and Vit, which will go a long way. Totaling up to almost 15% increase in efficiency. My MNK might have graduated from 40 PvP, but it is still fun helping some friends get to R30 with these twink gears. We're talking GL3 True Strikes taking off 40% HP on crit which is VERY often. Heck, on a pimped DRG you 50% Full Thrust Crit followed by 2 Jump attacks which will guarantee a kill if the healer doesn't throw a heal.

As far as Archer/Bard goes, well preferably you'd want to be Archer for PvP. The 3 DoT (Fracture included) will provide you quite the passive damage on top of your hits which is really sweet. And along with Barrage can put quite the pain.