1. Nothing wrong with OEM setup for spirited driving but it can fade quite noticably on the track - and also remember that in many cases you can get uprated kit cheaper than OEM, this is why most plump for it - 2 birds with one stone - more performance and cheaper than OEM.
2. EBC are fine if you realise what they are for. They are budget kit, and again are fine for spirited driving, but not track driving. The Zed is a heavy car (~1.5 tonnes), so you need good pads. Red stuff are equated to uprated pads on most cars, but for the Zed, they have admitted they are closer to stock. To update with EBC you need yellowstuff. As for the discs, again, they are fine for fast road use, but not track. The Zed being heavy it puts a lot of heat into the discs and EBC cant take it.
3. There are sooo many packages out there its very hard to offer advice, type of use and budget are the 2 most important factors. It sounds like you wont be tracking your car, but rather fast road useage, and you want something around (more likely less) than the OEM setup from a dealer. This would sway me towards the Ferrodo DS2500 pads and some form of EBC Ultimax or Turbo grooved disc. If you are going to track it though, dont be supprised if you warp the discs if you are heavy on the brakes, as they cant take too much heat. Fast road they will be fine. Have a chat to our traders - CS, Envy, ZMANALEX, they are all very knowledgable