I suggest wordpress handsdown!! Self hosted is the best way to go. I have a article about blogsites on my site if you are interested. You should really selfhost it so that 1 you can't lose all the contect and 2 looks much mor eproffesional etc. Let me know if you need help or info on it.

Not sure if I should be posting the link to my article on here or not so if I am just let me know!!

Thx