Really depends on your budget
Do you want to keep the existing size discs or go bigger??
Standard = 288mm
312mm upgrade
334mm R32 brakes
Or you can go and run Porchse calipers etc etc
If you want to kepe to standard discs have a look at Euro Car Parts - think they do ATE discs and pads which are OEM equipment
Or buy some plain discs and get uprated pads from Pagid, EBC etc etc
Most tend to upgrade to the 312mm's as all you need are the carriers; pads are the same but obviously the discs are bigger