I think I'm going to do the following
spray in liner (whatever dealer will do - hopefully line x or equiv)
+ bedrug mat.
I plan to cover it all with an mx4.

Other options would be no spray in and the full bedrug or perhaps the bedtread system.

Anyone have any major pro's/con's for one of the second options over my original plan?

I'd be open to even more ideas if there's a strong reason for them.