The comptech clutch is what will work for you, BUT not cheap. Mark B. ran this clutch with the CTSC and liked it. PM him. Many others, will not be easy on the leg in heavy traffic. The Exedy is a cheap clutch that will hold the power, but chatters a bit and would be annoying in stop and go traffic.
The stock clutch will hold the power, but not too long. I wouldn't get the oem with 400bhp. Honestly I don't think you will find a 400bhp clutch that will be exactly as easy as the oem. You will have to trade some of that for the extra holding power.