I ran a search on these forums for "300ZX master cylinder" and have done a lot of reading concerning the brake upgrades available for the 240SX. I have also gone over this page...
http://importnut.net/300zxbrakeswap.htm
The only thing I'm curious about is which master cylinder is optimal for the 300ZX front brakes with stock brakes in the rear? The reason I ask is because I've read that with the 300ZX brakes + stock rears the 1 1/16" master cylinder can be touchy. That page seems to prefer the 1 1/16" master cylinder, but he's using the rear 300ZX brakes.
So would the 1" master cylinder be better?
I like a firm pedal feel because it makes controlling the throttle with my heel easier, but I don't want it to feel like I'm fighting a brick wall.
I know this question is borderline subjective in nature, so I'll say that I loved the brakes in my '89 RX-7 convertible, and disliked the brake feel in both my '02 Spec-V and '02 WRX. I got used to both the Sentra and Subaru, but prefered the feel of the old Mazda best because it was more firm.