I got it simple... My LHS sells three brands of bottle paint: Testor's Model Master Enamels & Acrylics, Testor's, & Tamiya. I use rattle-cans from Model Master and WAl-Mart too... The main thing to remember is to use one type of paint for color-coat, the other to weather it... If you paint a model with enamel, weather it with acrylics, and vice versa...
'I use a number of craft paints though... They come in larger bottles with twice the amount and less than half the price of the above brands... You just have make comparisons with model paints, because craft paints have those cockamamee chick-names, i.e. Orchid, Mushroom, Forest Moonlight, etc...
Once you get it figured out though, you'll save a lot of money that way...