Those look like cool choices for the Arena. As far as balancing adventure and drama/tension, "Sail Barge Assault (alternate)" is definitely good for that. I also think it would be very possible to insert the Rebel Fanfare and/or Luke's Theme (or is it the Skywalker theme now?) at strategic points, and cut to more dramatic music when appropriate, and so on. I'll have to think about the Obi-Wan attack part.
I'm helping InfoDroid with the other Starkiller Ranch stuff, and if you want any help, I'd be more than happy to help lighten the workload.
I'm trying to think about battle footage. Is there anything usable in Lawrence of Arabia, do you think?