Do search and you'll find a lot of alternatives. Brembo GTP, 930 Turbo Brakes, Big Reds, different variations of "custom" 993 or 964 or 944 Turbo setups, Boxster brake kit from TRE,............... it's been covered a lot around here.
That being said, I did the 993 brakes on my car and it's a bit of work. Front required factory '95 993 calipers (adapted to fit the stock mountings), Wilwood HD 309x32 rotors with adapter hats and fasteners, new hardlines bent to make the hyd. connection. Rear required modified factory 993 rear calipers, 930 rotors and new hardlines for the connection. Also had to install a 930 boosted 23.8mm master cylinder, remove the pressure limiting valve, find wheels to fit over the new brakes, install some thin spacers for the rear wheels, buy appropriate pads for new calipers........... it adds up quick.
