Another advantage of going the 790 cam route is that you have 2 sets of cams. That would give you no down time as I have read some complaints on the rat site that the turn around time on regrinding your 865 cams can take a few months.

2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.