don't buy a clutch off of ebay, super bad experiances with me as well as my friend. an oem clutch should be fine, but it all depends on how you drive i suppose.
doing a clutch yourself isn't difficult as long as you have the tools. ask around to your friends and see if they can help you do it. paying your friend 10 mcdoubles is a lot cheaper than labor from a shop, plus you get some hands on experiance.