After many months focusing on crafting and gathering, I'm finally giving in and bothering to get my iLvl up from i75. I managed to get the following after a few days of Hunt groups + FATE groups...

i100 - Bravura Atma (I got really lucky with Atma)
i90 - Full Warrior/Hero set of gear, except for of course the ring...
i70 - Darklight Band of Fending

And now I have 907 SOL and figured I may as well use it. But... on what? Is there a purchase order I should follow? Do I replace that ring first, or...? Do tell, oh gurus of FFXIV.