I actually use several different free email hosts (aol, msn, yahoo, gmail, ICQ); simply because I am on instant messenger a lot; and needed screen names from each service.
The email address I use the most often is gmail. It seems to be the most secure from my experience.
I have never tried use myspace email; as I no longer really access that site at all.
I find it interesting that you don't list any of the other providers that are out there; because some of them are really amazing.
GMX.com - I have one account here; but they started blocking messages from a site I use.
mail.com - this provider allows you to choose from what seems like a gazillion choices when creating your address.
zoho - I just recently found this provider; and I have to say I am very impressed. They offer lots of little gadgets for your account, and the interface seems more like an actual mail application rather than just a webpage.
I am unable to vote in the poll; simply because I do not have a favorite email host, but also because your list is so small.