I only use Vallejo acrylics, for figures and for all the rest. They have two lines of colors one for brushing and one for air-brushing. Both are excellent to me.
In my experience it's better to prime the model; I use Humbrol's primer, so an enamel, but that's the only enamel I use.
To reduce the drying time Vallejo also offers a "retarder" but I hardly use it, since a drop of water does the trick, too.
My choice towards Vallejo acrylics is motivated by following reasons:
- their drying time: you can apply many thin hands of paint in short time
- their not having toxic fumes
- the bottles almost last for ever: I have some colors since ten years and they still work, while in Humorol's cans the paint dries after a year or two
- Tamiya's acrylics have the tendency to dry faster and to be cloggy
So IMHO if you go for acrylics go for Vallejo's or Andrea's which is the same.
BTW:
MERRY CHRISTMAS TO YOU ALL!