A good clutch kit is not too expensive if you just stick to the plates, discs and springs. If you want to replace the basket, center hub and pressure plate, you will spend some money. Relplacing the clutch is not too difficult. You should be fine replacing just the plates, discs and springs. Barnett makes good clutch components, I will be replacing the clutch in my LT-R with a Barnett Dirt Digger soon for about $160, it is a bit less for the EX. There are several other good brands too, Hinson, Pro-X, EBC, just do your research and decide what you think is best for your needs and budget.
Yours truly, sincerelly, love always, Josh aka The DirtDemon.