Vallejo Paints are the acrylic paints of the future I think. The general acrylic paint line they offer are amazing. They brush on nicely and leave little to no brush streaking when properly thinned. Their Model Air line is just as great. It doesn't have the bite as Tamiya acrylics IMO, but they cover better with successive passes of the airbrush. I highly recommend them.
I obtain my Vallejo paints through a local hobby shop, but I know VLS now offers them to order on their site.
Give them a try, you will not be disappointed.
Cheers
Rob