I haven't used 3DSMax since v.5...I think? And we used it only for a couple months till our company got Maya licenses.
For the most part, I've been a Maya junkie, since XSI Softimage wasn't (and still may not be) very widespread and I absolutely hated the 3DSMax interface.
But that was years ago, and one of my friends who's hipper on 3D says that the new version of Max is actually better than Maya (possibly since Autodesk has owned Maya for over two years now and probably have picked up a few things). With my friend's advice, I may be looking to try out the current version of Max, see how it works.
Overall, I'm still pretty much a novice at 3D, but I'd recommend choosing a program, and sticking with it till you learn at least the basics, if not the more complex stuff. Some companies get adamant about what software package you are trained on, but if you're doing good work, any company worth working at would choose you for your skills and let you figure out where the hell 'Split Edge Loop' is in the program that they use.
And if you haven't, check out
CG Society. It has forums and tutorial & FAQ threads for most major programs along with general 3D forums. And I'm sure there are other 3D forums of note, as well.