I use GW base colors (previously called foundation colors), and I always water them down. I also use GW washes, although I've begun to try other washes by Secret Weapon and Army Painter. Secret Weapon's soft body black seems to be a bit more glossy than I prefer, but I like their flesh wash a good bit. Planning to try their sapphire blue soon.
I have been using an Austrailian company called Derivan. However, they are no longer producing their MiNiS line of acrylics. When I run out, hopefully not for a long time, I may try some of their other acrylics to see what they are like. Shaking these paints thoroughly is a must, but well worth it.
And I use various craft store paints like Americana and Folk Art. Occasionally some Vallejo paints, too, and perhaps more often in the future.