My first set of suspension forks were a set of RST Gilas 120mm, i gave them hell and they held up well, in fact they are still going strong on a Diamond back dirt jump bike (not mine).
TF2 does a great job of keeeping them smooth, as well as the chain and gear cables.
Mine didn't have a lock out function in fact i'm yet to experiance lock out, but i beleive it makes a great difference to climbing and road sections.
For general xc trails they will be fine m8, i used them on the Mountain where i live (however i use the term mountain with tongue in cheek - 450 metres above sea level equates to roughly 1350 ft, about 650ft short of a proper mountain). Very rough fire road most of it. And some great steep bits and corners.
Fox / Marzocchi / Rockshocks would most likely give a smoother ride, but also cost a fair bit more, i'd leave them until you are doing more on a bike. Guaranteed it won't be long b4 you're riding more than once a week once the bug bites.
Happy riding Owen.