I will be in the same position as you shortly, my plan is to stick with the standard Brembo's for now, get the Performance Friction rotors, Ferrodo DS2500 pads, Goodridge lines, Improved brake fluid, and titanium shims which get a lot of stick from armchair scientists but if you check a few racing forums you will see that the proof is in the pudding and in practice the shims work well
The above set up is considerably cheaper than going BBK, and should fulfil my need's. Don't take for granted that you have Brembo's, their still amazing brakes!
The above mentioned gear i'll be getting from Alex, as I've been to his place and seen the quality of the products, top notch