You didnt say which discs you have thought. EBC wont last doing trackdays, I managed to kill a set doing an airfield day, they're fast street discs, not meant for track days. DBAs if you have the 5k series would be ok, but the lower ones again arent designed for heavy track use, so you could kill them in a session, even if you warm them up and cool them down properly, they cant take the temperature or hammering of full out laps in a heavy car.
Speak to Alex, but my guess would be a BBK starting at about £1800 for some ksport or more for AP racing etc. That or it might just be that you need some DBA 5k series which are meant for track work