Yep, I've only ever used acrylics two or three times (don't like them overall), and I found that the Vallejo Model colour was far superior to Tamiya, and just needs thinning around 50/50 with water.
The Vallejo Air is the same stuff, just ready thinned for spraying - so buying the Model Colour, at the same price, gives you twice as much paint, and it can be brushed - or as well as acrylics can be brushed at least.