I know what you mean, when I got my T8 the brakes were the first thing I wanted to update after a couple of "Oh my gawd the lever is back to the bar and I ain't slowing down much" moments.
Don't go down the P34 caliper route. P34's are later Brembo brakes with a brake pad for each of the 4 pistons in the caliper. I'm not knocking them, I have them on my ST2 and they are without doubt awesome. In fact my ST has the best stopppers of any bike I tried at the recent Cadwell trackday. Trouble is that for a T8 they are just plain wrong. Because they have 65mm spacing on the mounting holes you can only fit them to the earlier 40mm spacing forks on a T8 with an adaptor plate. It works, and you'll have fabulous brakes but it will look awkward and clumsy (not to say plain ugly).
I would go for the Brembo radial caliper and the GP billet brake mod, either one or both in any order. You'll have to be pretty flush to buy both straight away...I got the GP billets first because they're pornographic, but they do need the master cylinder uprated as well to get the best from them.
Jools
Threaded Mode