Tamiya, Vallejo, Lifecolor, Humbrol, Revell, Model Master, Gunze, Akan, etc.  So many to pick from.  The best way to go about it is to buy a couple bottles form several brands and just try them out.  You may end up going for more than one for different purposes.

Tamiya and Gunze are nearly fool proof to airbrush, but they are alcohol based acrylics. Neither will brush paint very well an the solvents tend to reactivate the coat below causing it to pull up.  Tamiya's color selection leaves a lot to be desired and Gunze no longer dsitrubutes their acrylic line to the US so they are very hard to get a hold of.

Vallejo have two lines fro modelers, the Model Color line and the Model Air line.  The Model Color line is thick and most people swear by it for acrylic brush painting.  They have a huge color selection, but most of it is not matched, or stated to match, with the typical names we're used to.  Some of the Model Color paints use cadium or other heavy metals so you do not want to airbrush those specific colors.  The Model Air line is prethinned, airbrush ready paint.  Vallejo paints are fragile so you'll need something under them.  Vallejo also offers a ton of other products.

Lifecolor is another popular choice by brush and airbrush painters.  They make great color matches and offer their own weathering paints and pigments which are also acrylic.  I haven't had much like trying to brush paint Lifecolor, but their Tensocrom weathering paints are really easy to use.  They have good adhesion as well.

I'd stay away from Model Master.  They have poor adhesion, don't always brush well, and some of the color matches are off.

Akan paints are from Russia and thus hard to get a hold of, though Linden Hill does offer some of their colors and may bring in the whole line.  They are easy to brush and the color matches are great, especially for Russian stuff.  I've had trouble airbrushing them, but others like them.