The HP of your motor is not such an issue in braking, its the weight of the car ,which being a 1000 is very low, you only need the brakes to be as big as will do the job any bigger is just going to add unnecessarily to your unsprung weight which will be to the detriment of your cars handling and performance.

You say your "not worried about weight atm as i can make other things lighter"

In the front the the unsprung mass is only the hubs the brakes the wheels and tyres, there is not a lot of "other things" to make lighter.