Vallejo Model Colors are the ones I use most frequently. I like the range of colours, the pigment-rich consistency of the paint, the bottles and the finish of the paints once dry. They handle thinning very well (better than most paints I\'ve tried) due to the amount of pigment in the paint. They work very well with how I paint, in general.
I also like P3, and the satin finish isn\'t too much of a problem for me. I mostly mix colours, and seldom use paint straight from the pot. Just a small amount of Model Color in the mix, and the paint dries flat. If you\'re using only P3 paints a drop of matte medium will sort things out. The paints have a very nice consistency, and a very nice selection of colours.
I generally dislike Citadel (GW). The paints thicken very quickly and dry out inside the pots. So, they change their consistency over time, and generally dry out completely with quite a lot of paint still in the pot. I know you can work around this, but with other paints I don\'t have to, and with the price tag that comes with Citadel paints I really think they should be better. I also remember having lots of smaller niggles with plenty of the paints. I do like the metallics and the washes. But, for regular paints I find better paints and more value for money elsewhere. Model Colors, for instance are considerably cheaper and you get more paint in the pot. I don\'t like the Foundation paints much.
Vallejo Model Air is a nice range. These are very thin and have very fine pigments. The metallics are really nice. Some of the other paints can also be useful for glazing or washing.
I\'m not particularly fond of Vallejo Game Colors. They are thinner than Vallejo Model Color and have weaker pigmentation. Strange things can happen with some colours as you thin them, and like Avelorn mentioned, some paints change when they dry. I like a few select paints, but generally, I dislike the range.
There\'s a handful of ranges I haven\'t tried... Rackham (heard mostly bad things about them), Reaper Masters (have heard mixed things about them, both raving and ranting...), Coat d\'Arms (basically the old Citadel paints, that DIDN\'T dry out in the pots), etc.
But, this illustrates how individual this matter is. You need to try things out for yourself and see what you prefer. I advice against buying a big set of paints. It is better to build your paint collection more slowly and see what paints you need and which brands you prefer. A big set of paints will definitely contain several paints you will never use. And, if you have that big set you will be more reluctant to try other brands and might miss something that will help you.
