Is there a reason that you don't want to use the Gunze Aqueous paint? IMHO I think that it is some of the best paint out there. Sure, mixing it can be a bit of a hassle, and mixing it means that you have to buy 2 bottles instead of 1, but if mixed correctly the colors are spot on.
Plus, the paint is very tough. Just the other day I painted some piece with Gunze Sangyo paint. I put masking tape over is and sheared the tape off. In other words I pulled it of sideways...not directly away from the piece. That didn't affect the underlying paint at all. If that were Model Master Acryl the paint would have come right off.
I highly recommend using Gunze Sangyo.