I have 7782 IP.

I own 49 champions, and have runes for most every situation.

I'm looking at the following Quintessences (I have everything I want in Marks, Seals, and Glyphs)

Gold per 10 (1545 for 3)
Armor Penetration (3075 for 3)
Experience (6150 for 3)
Magic Penetration (3075 for 3)
Mana Regen per 5 [possibly per level] (3075 for 3 [either way])
Movespeed (6150 for 3)

I have Attack Speed, Flat AP, Flat HP, CDR per level, and Dodge (I main Jax :P)

What should I buy? It doesn't have to be those Quints I listed, it can be any champion, too. I'd list them all here, but it's late and I don't have the patience. Just throw things out and I'll tell you if I have it already.