I am posting only to reinforce PVT Joe's post. I too have found Vallejo paints very high quality. However, since I am on a limited budget, 90% of my paint supplies come from folk art, creamcoat, and apple barrel simply for the cost. I have had MANY bottles of those brands last me several years without much loss in quality. I have never tried reaper paints, and I do have some GW metallics because the cheaper metallics are crap.
If you buy any Vallejo paints the best to buy are whites, yellows, and creams because these colors are the hardest to paint over other colors with. Vallejo has a really high pigment content and I have found that they cover better than any other brands of the same color. Since I prime everything black... this works out best for me.
Your best bet is to find what you are willing to pay for and then settle on quality within your budget... that's what I did anyway. I have about $80 worth of painting supplies that have collectively lasted me more than 5 years.