bbk's are pretty much all show on the street, unless you count those few times when you have an emergency and need to brake hard from 100mph+ in your Camry. Otherwise you'll likely never exceed the heat capacity of your stock brake system. Hell, you could probably run drums in the front as far as street performance is concerned.
That said, the top three bbk manufacturers tend to be Stoptech, Brembo, and Wilwood. Stoptech makes an application for the Gen4 that you can get to work on a Gen3 for those who are interested. You used to be able to get it from Underdog Racing Development, but they don't seem to carry Stoptech anymore.
Keep in mind that just because some company will make a bbk for you with uber large calipers, pistons, and rotors doesn't mean the package is any good. You have to consider various factors like whether they did any work sizing the leading and trailing pistons properly to minimize brake pad taper, the availability of different brake pads (the Stoptech ST-40 caliper utilizes a very common Porsche pad I believe), ease of changing pads, the metallurgy of the friction ring on their rotors, the vane design on their rotors and if they're unidirectional, and overall weight of the system.
If you're in a pinch, wait for someone to sell their Ericsol brackets that allow fitment of Supra TT front rotors with stock V6 front calipers, or see if you can hunt someone down with them who will let you borrow them for a machinist to copy.