Equip help

[Seyb]

so take 180 MH and OH then? meld my 150 with all my CON/CP materia and start the way to 170?

If you have enough time, yes. But keep in mind that the mainhand alone takes 3 weeks of red Scrips. I assume the offhand will require the same amount.
If you don't have the time, you will have to meld your way up. :/