if youre going with a stage 1 kit, like skunk2's, upgraded valvetrain is not neccesary, the stock valvetrain of the Type S/R motors are more than capable to keep up, however, go any further than a stage one, and valves, springs and retainers are going to be suggested.
Whichever cam you decide on, ask the manufacturer what they suggest, most will tell you oem valvetrain will suffice for the low end camshafts, unless youre planning on going big with a really high lift cam in the future, i wouldnt worry about it. as long as everything is installed and torqued correctly at install. you should be fine.