I'm currently running the stock brakes on my Lusso. Considering upgrading the front brakes, I'm looking at various vendor sites (Goodwin Racing, Eurocompulsion, 500 Madness) the only brand offered I see is Wilwood. How do they compare to Brembos (which I assume are available through the Fiat dealer)? Any other options/vendors that I should consider? What are the pros/cons of a 4-piston vs 6-piston setup?