Your animations should transfer ok, you can add the poser 6 runtime as a second runtime to poserpro. There is a beta of pro 2010 I think they calling it. I would expect to see an upgrade price and a lowering of pro 7 soon. Smith micro did have a full license available at the upgrade price, dont know if thats still going. You may want to wait for the new pro version to be released.

There is an excellent Poser to 3dsmax utility , about $60 I think. but I forget the site. Its called something like Poser2max.