Thanks for the reply... i think we are leaning towards the San Agustin route, but will ask locals for advice as we head south. Please do let us know if you get more updates. Likewise, if we get any news on this subject we will post it here.
From what i heard, the roads between Manizales and Bogota are not in the best shape right now, either... you may have a tough time getting over to this side of the mountains because of all the landslides!.
Anyway - keep in touch and good luck with your travels!
Malcolm and Sara