Anybody have any thoughts on which one is a good fit for a fairly new user to a Droid?
All 4 have their group of loyal users, it comes down to personal preference. Why not try 2 at a time, or all 4 and download home switcher from the market so you can toggle between the 4. I used to be a loyal Helix user until I found LauncherPro. I tried ADW but not really for me. Hope this helps!
I do not think Helix runs under 2.2. Home switcher does not run under 2.2
Each is a great home replacement. All have their individual strengths and weaknesses. I suggest you download and try them all and use the one that suits you best.
I'd give all a try, like RoNYC said, but unfortunately Home Switcher doesn't support Froyo. In 2.1 you could select any home as default or "launch" a home to try it out (pressing "Home" would take you back to your default Home). Now you can't select your default home in Home Switcher (although you can still "launch").
There is an app called ClearDefaultHome which simply clears the default so the next time you press "Home" you'll get a choice.
Personally I have ADW and LauncherPro Plus, but I use the latter mostly.