I'm just now seeing this thread @Nubster. I think you saw in my thread, I just put a down payment on a Jamis Renegade Expert. You mentioned $2500 for 105 is bad price for the specs. (MSRP is actually $2599)
If we are talking about a gravel grinder, I think one of the most important things is tire clearance. There were only 2-3 bikes that I saw that comfortably could handle something 40-43mm. Which led me to the Jamis and Warbird. I researched every single bikes spec sheet and I would say the Jamis is one the best bang for buck spec'd out of every one of them.
Latest 105 11 speed (If you pay for better stuff, all you're getting is a little weight reduction imo)
Full Carbon frame
Full Carbon fork
Shimanos latest hydro disc breaks
40+mm tire clearance
All the mounts you'd want for commuting/exploring
Lifetime warranty on the frame
The list goes on, but hopefully you see my point. Compared to something like the warbird.. I didn't see much difference for $1000 extra (assuming you want a carbon frame) Not to mention Jamis warranty.