PERSONALLY, if they were WILLING to turn Kurt Angle heel, I'd say do an Angle/Edge feud for the title.
I mean, look at it storyline wise. Angle has been OBSESSED with winning the WWE Championship ever since mid-late August, and has tried everything he could to get it.
Then, all of the sudden, someone who hadn't had a WWE Title Shot and wasn't even SCHEDULED for one waltzes in and wins the belt.
Angle would want to do whatever it took to get that belt off the "upstart" Edge.