what brake upgrades can i get? what rotors are good? i need response quick want to get the work done this weekend

looking at getting the brembo slottled and cross drilled off gbc.com

i would also have to get the braided brake lines, where could i get those?

I have powerstop cross drilled rotors...got them for cheap. Ive had them on my car about 2 years, no cracking on them at all like everyone claims they do. im just using them in conjuction with some semi metallic pads from checker with a lifetime warranty...this setup has worked alright for me so far

Are you wanting to upgrade to better stock or aftermarket? If your wanting to upgrade to stock then i believe the GSR has 10.5" Rotors and if you have an Si then you can do all 4 wheels and stop good. :D