I plan on getting a new clutch for "Bradley" -(girlfriends car) it's an 05' Cooper S convertible. Has future plans of being her track car. But for now we're looking for something very streetable, stiffer than stock, and will eventually be a decent start for track practice.
Having had a both a Clutch Master with Spec flywheel and an OS Geiken I've found the OEM like Valeo is one of the best replacements out there. Handles the power of modded MINI, doesn't rattle and it's drive-able. Unlike the On/Off switch of the "racing" type clutches.
Like Nathan said the Valeo Clutch kit is hard to beat for value, and reliability. We've installed and sold several with great success. Valeo Clutch and Flywheel kit R53 - Way Motor Works