REAPS is crap. If you want to use a regular rubber (ie not Rhop) PDI W-hold is the way to go. But seriously, Rhop is like night and day.
The gun will be good in stock form. As far as VFC goes, you don't need to upgrade anything til it breaks, unless you want to go for a more high performance build. The first thing to go will be either the piston or tappet plate.