I switched to Gunze acrylics last year, and use them almost exclusively.
I've tried Lifecolour, Tamiya, Vallejo & Model Master, but Gunze are definitely the best.
They have also just brought out a range of buffable metalic acrylics as well.
You can use either Tamiya acrylic thinner or water as your thinning agent, but the Tamiya minimises tip dry when air brushing.
Karl