For importing private key- Is the best way to import it, and then just spend it to one of your existing addresses? Even if u spend half the coin, the other half just goes to a change address in the same wallet right?

I never understood the big deal about "sweeping" privkeys.  Isn't my way just as secure?

You can do the same in Armory right?
I guess i would rather trust myself manually spending it & seeing the transaction, than adding another hidden "sweep" step to the process?  What is better about "sweeping" in armory, than just spending it to urself?