dont go upgrading to a performance pad if your just everyday driving. upgrade to something like a bendix advance or something. performance pads have a much higher operating temp, so you wont stop very well straight away

and as for your upgrade, i think the LS has a 10" rotor, i may be wrong, but why dont you upgrade to a prelude, 11" rotor and twin pot calipers?? you have the correct knuckles already so it should be a easy fit. you can ask someone like RDA or DBA for a blank prelude rotor, then get it drilled to your 4x100 stud pattern.

much much cheaper option then geting a ITR setup.