Hi Spongebones: Sorry I can't give you an info on the iv BP's, I know there were some that finished Forteo and went on oral BP's but they haven't posted in a long time. There was one iv BP user that didn't take Forteo but I haven't seen any new posts from her either.
I'm finishing Forteo at the end of June as well, but I'm going to take Evista. I did real well on Forteo, without any side effects, but while I was on Actonel it did cause some tolerable bone pain. My Dr said that since I had that problem the iv form would cause even more intense pain since that was the only side effect I had from Actonel, plus the iv form would have greatly increased side effects due to the strength of the med.
I hope there is someone out there who is in your situation, but I haven't seen anyone post about it in months. Sometimes the NOF has new articles on the latest news in iv BP's (bisphosphonates) you might check there.
Good Luck with your decision, and would Evista be a possibility for you? I know that Evista isn't considered a first line of defense for osteo, but I've improved greatly (1 whole point) and hope that it will maintain my current scores. I'm also hoping that there will be other options available down the road so I can switch to something else if need be.
P.S. I agree with Taape, if you can find a Dr that will let you stay on the Forteo (provided you want to) do that. I've been trying to find some info on continuing on Forteo longer than 24 mos, but apparently the info hasn't been released to the public.