Oh crap, Chaos found a makeup thread.
It's all over now.
My favorite brand (for most things) is probably Milani. They're relatively cheap, high pigment, last for a while, and you can find it at CVS. Which there are like...fifty of in my hometown. Milani's lipstick, especially the darker colors, are great. Nail polish is hit or miss, though. I recently found Sinful Colors, and they work damn nice. They've got the neon green that I'm planning on hijacking from my mom soon.
Eyeliner, I generally use liquid on top of a softer stick. For liquid, I think it's called Prestige? Stays on good, comes off with water, variety of colors. They have this really nice sky blue I used to use as a liquid eyeshadow.
Concealer and whatnot...I think I use Revlon. Been a while. I used to have this MaryKay stuff a friend bought me that worked great (I've got a weird skin tone and it's damn hard for me to find a concealer that matches) but it made me a litter paler than I am, which...kinda aggravated me. I'm Italian, damnit.
Stuff to avoid? Wet and Wild, for the most part. Lipstick is fine, some of the eyeshadows are okay, but their stick eyeliner and nail polish are AWFUL.
Kyril, have you tried using the mineral/natural makeup brands? My aunt is allergic to almost everything and she's able to wear that stuff.