Grant,
Vallejo acrylics are very popular with figure painters and the more traditional modelers alike. The Vallejo story is an interesting one. Vallejo got it's start marketing to the professional artist market.
Model Color for brushing, Model Air for airbrushing and depending on you airbrush setup may be useable right out of the bottle.
Vallejo also have colors specifically marketed for the figure and fantasy painting market - Game Color and Game air.
Lots of colours to pick and choose from and of course you can always mix and match to suit.
Vallejo are a water based acrylic and you must use their thinner, retarder, and flow improver (etc) or similar compatible product BUT not Tamiya X-20A or any other alcohol based thinner or reducer.
Vallejo has an airbrush cleaner which seems to be nearly identical to their thinner and seems to work a bit better BUT start with their basics and experiment from there.
There are also AK Interactive acrylics, Citadel, and Humbrol but I have no first hand experience with those.