agl,
what engine/car are u running? upgrading to a stronger set of brakes might be overkill!
might i suggest the following setup (stage 1 apparently)
1. pro-rs hoses/goodridge = 380/399
2. DBA discs slotted = 825/pair or axt discs = 600/pair
3. mintex or stoptech pads = about rm200 for fr and rr i think. gotta check la.
4. dot4 brake fluid
i wouldn't recommend DOT5 as it is NOT water solluble thus if water gets into ur system, ur screwed. dot4 and dot3 is good enough for almost all applications. also dot5 can't be mixed like dot3 and dot4.
good luck :)