If you're waffling, I'd say keep it. My observations on used bike values in my neck of the woods seem to suggest a private-party price floor for bikes of ANY type, and even age, of about $2500-3000 in good condition, though not many end up with much over 40-50,000 miles on them. Your '07 is probably in that value range already (I doubt I'd get more than $4k for my 12,000-mi. '09; in fact, a local dealer even gave me that as a trade-in number, which surprised the heck out of me), so it's not likely that you'll leave all that much dough on the table hanging onto it for a little while longer 'til you truly make up your mind.
'09 Versys in Blue