It's overkill for what you are going to use it for. The stock set up is very capable as well and you might want to just try that before deciding to drop any cash.
I had the 5100s all around with Icon Springs and do a fair bit of trails and rocks and just upgraded to the Fox 2.5 DSC, and Icon UCAs Delta Joints (Camburg was out of their version and only had uniballs) and it's riding nice for what I use the rig for.
You don't need the FOX (or ICON or King, etc) if you're just on normal fire roads, dirt trails etc, and the stock set up might even be fine, or just blow it out before you upgrade it.