I would figure out where you want to go first and what class of seat you want... before you transfer them. Delta may not be your best option.
Also consider which other airline program you will be able to get *more* miles/awards; that is, which other charge cards do you have?
You probably don't want to end up with a bunch of orphaned points sitting at some other program, where you don't expect to be able to use them, or transfer them to one of those partners, etc.
GC