Dude. Get the GP/10 quints, armor yellows and whatever blues you want, I use either MR per level or AP(if you know you're going a more AP sup.)
My reds are Mpen, but I use that set for sona, lulu, leona, nunu and zyra, I like the little bit of extra damage it gives me. I've never once had a problem, and neither should you.
Some people like to put things like Movement speed and the like in, I personally don't really find a use for them.
I can't say I'd approve of mana regen because its damn easy to get, and with just a Philo stone I can BB every time and snowball whenever necessary, but if you're bad with your mana I suppose it could be wanted...