I suggest getting FCE. It is far more advanced from iMovie. Then once you get used to FCE and you are ready to be challenged more, move up to FCS2.
That is what I did.
Not to be rude but, why drop money on FCE and then use it for 6months, get used to it, and then buy FCS2? Why not just jump straight into FCS2 and get used to all the great pro apps right away. Thats just my thoughts.
FCP6 is great and Motion isn't all that hard to learn and the templates are great. Soundtrack Pro is just as easy as any audio program. DVD Studio Pro is fairly easy to start with and the templates work well until you learn it in and out. Color and Compressor well, you can take a tutorial or seven and learn all you need to.
My opinion, skip FCE and go straight into FCS2 (or FCS1).
But then again, what are you doing with this. Are you going to try and do editing for a career or just as a hobby? If you're going to try and make money with this, make the right investment in the beginning. If its just something your doing for fun, I still recommend FCS2 because by using all the bundled apps you can have something that looks just as professional as someone who is really good with FCE without much training or effort on your part.
Ohh and as far as the Smoothcam thing goes well, learn to control the camera better. Steadier footage beats the heck out of footage that has to be smoothed out in post. If you need to, pick up a shoulder mount and take great steady shots with no need for Smoothcam.