I want to buy a few bitcoins and keep them in an Armory offline wallet but there are some things I don't quite understand.

My plan is:

I will get a computer that has never touched the internet and I don't plan for it to.  I will install the Armory offline client on this computer and create a new wallet.

Here is what I don't quite get (sorry if its confusing):

Once I create the wallet, if I understand correctly, I can then print out a paper wallet, even before I add any bitcoins to the wallet, which has the private keys on it. 

What I don't understand is this: Once I print out that paper wallet, will that paper wallet always let me access my bitcoins regardless of how many bitcoins I send to and from this offline wallet?  Basically, does the paper wallet or private keys change every time I send bitcoins in or out of my wallet?  Or do the private keys on the paper wallet stay the same no matter how many times I move coins in or out, as long as the wallet and addresses are the same?

Thanks.

Thanks for the reply.

Is it safer to have the wallet on BOTH Blockchain.info and Multibit?  Or ONLY on Multibit?  How would I make it so that my wallet would only be on Multibit?  Is it as simple as making a new address in Multibit and sending the BTC from Blockchain.info there?

If I import a Blockchain wallet backup file into Multibit, what happens the next time I login to Blockchain.info?  Are all my coins gone from Blockchain.info and now in my Multibit wallet?

I've tried looking for information on this but couldn't find anything.  I'm looking for a simple script that will let me show a live mtGox Bitcoin price ticker on my website.  I don't want to steal anyone's script, so I was wondering if there is a ticker script somewhere that I would be able to copy and use on my site.  Sorry if this has been asked before, and thanks in advance.