Signatures

If you can't tell I'm new to the blog world, and while I'm getting my feet wet I've been playing with formats, colors, background images, etc. so that I can find my style. My latest blog experiment is signatures. Should I put a signature at the end of every post? And if so should I write it myself or just choose a font that best suits my "look?"

Today I played with signatures at My Live Signature and, using their signature creation wizard, picked the 5 below as potential for my blog. Thoughts?

I'm so indecisive...