There is a theory that picking the right tool when it is easy to make that decision goes a long way towards removing frustration at a later date.
So, before you make the decision one way or the other, it MIGHT be worth thinking about what you intend to do at a later date, and make the decision whether a little extra work today will pay off down the line in hours of time saved in capabilities you might use.
Surf
http://mamboforge.net/ and see if there are any modules you might want at a later date. Then... if you still want 'just a blog', you'll at least know you made the right decision.