Funny, we are about to go through the 'painting' thing soon too. I can't stress how useful simple white paint is to have around (for colour blocking or fixing up) as well as a non matte black for defining.

Very good point, Manzabar, and it's something I definitely should have mentioned- primer is great stuff!

Also if you're making the transition from dark to light, I'd strongly recommend laying down a coat of primer on the wall before you start in with your paint.

I can't stress how important the "good quality" paint is.  We made that mistake in the past.

Your timing is perfect!