I like the banner idea, but we actually do already have the simple post rank system. If you look the below your forum name. You will see your title by post. More post = better title. Though I do like the idea of bar title.
Oh, i understand, i didnt paid enough attention :P, theres already a rank system, well thats cool. Hmm, the banner would be an extra then. If you decide to use the banners you can ask me to make them, would be real quick (i did those that are on my 1st post)