Dealer stuff is best in my experience.

Also you'll get the right o ring for the water pump. Mine (aftermarket) came with the wrong o-ring and not having a 2nd car or access to the parts store had to re-use my old o-ring w/ high temp RTV. It started leaking soon after.

It's a complete R&R to fix it (timing belt, everything have to come back off).

Time is 6-12 hours figuring you haven't done it before and will be extra anal like I was about keeping bolts/fasteners with the parts that they fastened then you'll torque everything to spec.

I'm sure a competent mechanic can get it down to 3-4 hrs. IIRC it officially books for 6 or maybe it was 8 hrs. <img src="/forums/images/graemlins/kewl.gif" alt="" />