Definitely agree with HIHO - the stock clutch is more than adequate for stock HP/TQ levels and a bit more. It's relatively modest price and ease of install are definite pluses.
FWIW though - I've replaced the stock clutch system twice now within ~200 miles. Both were replaced under warranty, the first at 51K (it's getting the second as I write this). There seems to have been a production problem with the stock pressure plates causing a choppy engagement and a rattle. Does any one know of any production dates/numbers to be avoided? That would be helpful in avoiding some of th snafu's I'm experiencing with mine right now and those looking to replace stock with stock.