lol nice,
my advice to you is JUST DO IT
I have coins on their exchange and coins in the regular wallet and coins in the vault.
As you likely realize, with many things related to bitcoin, I like to brainstorm about my actions and my contemplated actions (especially when I am making fairly significant changes), and that's part of the explanation why I have a 5800+ post count on this forum.
I will probably leave a few coins in coinbase in each of the three locations (wallet, vault and exchange); however, I am in the process of removing some coins from the vault (apparently, it takes 48 hours), and thereafter I will transfer about 90% of my holdings out of there. I may change the amount later, but 90% is my initial projection. Upon reflection, this becomes a bit troubling for me, because I had accumulated most of my coins through Coinbase, and until now, they have held the most coins for me than any other location. I have my coins distributed, but still at this point Coinbase still has about 50% of all my coins. After this move (probably two transactions on the blockchain), they will have less than 10% of all my coins.
Also, it is a bit ironic that I have been a bitcoin user for more than 2 years, and it surely does take a long time to learn about bitcoin and to create a number of wallets and even now, I am trying to consider other wallet solutions (and some of them just seem too technical and complicated and somewhat filled with one kind of risk or another - whether that be 3rd party risk or the risk of me screwing it up, somehow).
you need to save this html page,
remove internet wire ( or reboot with a linux live cd or usb )
print out the paper wallet
reboot.
cut the private in half ( use scissors ), hide one half of the key in your ass and the other in a bank vault.
this will give you the most secure / simplest wallet solution i can think of.
sounds like you needed to take out a good % off BTC of the exchange for a while now...
exchanges can implode anytime.
MtGox wasn't the first and it wont be the last.