What kind of "help".....
are you looking for? Are you looking for someone with a shock for sale? Are you looking for specifications for your bike? Or are you looking for recommendations on which to buy?
If you are looking for one for sale, I can't help you there.
For specifications, your bike requires a 6.0 x 1.25" shock. These are available aftermarket both from Fox and Manitou, I don't have any information on X Fusion.
As for recommendations, I assume that you are talking new? You state you are looking at an RP3, and S Type. My personal preference is for Fox, but Manitou makes a nice shock if you like the SPV style platform. Personally I'd go Fox. You have 3 platform settings at the click of a switch, as opposed to having to fuss with SPV chamber pressures. But the SPV chamber is more adjustable. Either way both are good shocks. As for the X Fusion I have no information or experience with it, so I can't really comment.
Anyway, knowing what type of "help" you are looking for would be useful!
Good Dirt