I would recommend DS2500 although they need careful run in. A better but more expensive option are Pagid blue pads or performance friction pads, both will cost £120-£140. A lot of people on this site have used the K-tec kevlar pads and swear by them I havent. Theyre very cheap in comparison to Pagid or PF.
If you can get the spec on the pads youre considering, you just need to look for the friction coefficient curve. Itll tell you about the amount of friction (0.4 in most good OEM pads, 0.45-0.50 in higher friction pads, and around 0.7 in race pads). You also need to look for operating temperature, and unless you intend to swap your race pads every time youre on track, you need to get pads that work from fairly low temperatures, typically 100-150 degrees, otherwise you will have no braking when the brakes are cold.
Its worth investing more in new compounds which give you the best of both worlds, cold operating temperatures and high friction coefficients.
I wouldnt worry about the discs at this stage. If you take the car on track a lot, youre better off getting ventilation on the brakes (pop the fogs out etc) and if you go for heavy braking, you can consider changing your brake fluid to DOT5.1 which can handle higher temperatures.
I would start with Pagid or PF pads and see how you get on.