Here's some basic piston area to master cylinder ratios that I know work pretty well. I have this one on my GTD and am very happy.
Front calipers are 1.75 X 4 and rears are 1.375 X 4, master cylinders are both 5/8 (.625)
Front total caliper area (both) =19.28 Sq inches, Rear total = 11.84. For a front caliper to master ratio of 30 to1 and a rear ratio of 18.9 to one or the fronts are about 58% bigger than the rears.
However I have a adjustable proportioning valve in the rear line and I believe it is reducing the rear pressure by about 10-15%. My best estimate is the front to rear adjusted ratio is very close to 66% on the fronts and about 33% on the rears.
I used this model to do my SLC and with the same ratios I am very happy with it's balance.
There are other variables such as pad friction, pad area, peddle ratios and rotor diameter. All of which have varying effects of overall performance, but if you start off with good caliper and master cylinder diameters sizes and appropriate ratios between the two it will help you start off close to a optimum setup that can be refined with pad selection and balance bar adjustment.
As to your car. I think that you may fine that the 1.5 fronts may be a bit small, may be difficult to match to rears, and will require a heavy foot. But then again you may like it that way. Anyway I hope this helps.