Big Brake Kit Post!
Brembos: $1650 + Shipping & Taxes
Brembo 4 Piston Fr Big Brake Kit for 05-09 Mazda 3 | eBay
Pros: Well priced, Brembo street cred
Cons: Single Piece Rotor, Brembo wank factor
Willwood/AP 4 piston kit: $1650 (+600 for AP Calipers) + Shipping & Taxes
2007-2008 Mazdaspeed3 13" 4 piston performance big brake kit
Stop Tech: $2200 + Shipping & Taxes
StopTech Big Brake Kit Mazdaspeed 3 MS3
Pros: 2 Piece Rotor
Cons:
Willwood 6 piston caliper: $950 + Shipping
2007-2008 Mazdaspeed3 6 piston performance brake kit
Pros: Well priced, fits stock rotor
Cons: Willwood calipers are ok, but are at the cheaper end of the spectrum.
Vsport/AP Kit: Likely ~$3000+
V-sport
Pros: AP Calipers are top notch, DBA Rotors are excellent value
Cons: Costly
For the record: The stock calipers are amazing for what they are, with an aggressive pad and rotor combination they provide ample stopping power. The issue is that the pad starts to wear unevenly when subjected to large forces and I am getting tired of changing pads and rotors over all the time just for track days. Pads are a lot easier to change in fixed calipers as well. I am conflicted over this decision, I just don't need extra stopping power, if I did then this would be a no brainer. It's more the ancillary benefits that I am after.