I would have to agree with Bads on the size of the signature. Why not use the last option and place your system specs beneath it. This way, if you change anything to your computer, you do not need to worry about making a new signature to reflect the change. Something like what I did.
[Edit]
Just realized that the one I like is already being used as your signature. :lol1:. So why not just add your specs beneath it in text...
-SlickVic78