depends how much power you've got, and how often you need to brake.

if you know the 'ring well, imo you don't need very big brakes unless you're going to be doing laps non stop. if you do a lap and then chill for a bit before doing another std brakes are pretty much good enough, and 4 pots and 330's certainly are.

other tracks are different though, particularly when doing a track day where you're caning it for say 15 minutes non stop. then, depending on your power, tyres, suspension, weight, driving style etc, you may feel the need for bigger brakes. if you've got a car that handles well, who needs big brakes?