There is no point to using a triple plate clutch unless you are building a professional level race car that is making very large amounts of power. I don't know of anyone in the focus world using one. I think there are one or two at the world challenge level that are using dual plates, but even that is iffy.
The stock water pump is just fine. The cooling system in the focus/duratec is more than sufficient for almost any application.
The stock clutch should serve you fine until you pass the 200hp mark...as long as you aren't riding the hell out of it. After that Stage 1 or 2 would be more than enough for what HP you could coax out of the engine. Anything else would only make for harsh engagements and make daily driving extremely painful.