You could try the Titan thread over at xda-developers
http://forum.xda-developers.com/forumdisplay.php?f=382
i think Alee's 6.5.x is the most up to date for 6.5
you would have to run the generic rom and then use dcd carrier cabs for your carrier.
Before you run the generic rom though you have to unlock your 6800 first
When I had the sprint mogul I used both 6.1 and 6.5, they seemed to run the same for me, but i preferred 6.1 over 6.5 more. I also used spb mobile and it still ran nice and smoothly for me.
If you don't like those roms you could always build your own. the easiest one I use is BuildOS, which is at ppckitchen.org