I love my battery only charger and the spare OEM battery. When the battery wears down, after a heavy days use - I can quickly swap them out. If you plan on using the GPS, the vehicle mount is also great.
I really like the dock station. Sits on my desk plugged into my computer. Great for charging and for me it's a good place to just put my droid on my desk. That way I don't have to worry about stuff bumping/scratching the phone while it's on my desk.
The genuine Motorola desk and car docks are $20 each on Amazon, including the chargers. These are nice to have, but only if you do not want a hard case for phone.
I'd say stay away from hard cases, my Seidio one scratched up the edges. Seno leather cases seem good to me if you're looking for a nice case, although I haven't tried them first hand. You might want to get a screen protector, I don't use one but I've been considering checking one out just to keep my mind at ease.
take it from me, zagg blows. Get a ghost armor. zagg feels sticky and you lose screen sensitivity. Ghost armor is not and you dont lose any sensitivity.
For a case....OTTERBOX commuter all the way...And it comes with a damn nice screen protector..And this case does not add much girth or weight to the unit.
And what can be said about otterbox protection that has not already been said..