You might want to consider this one we've made. The look and feel of it is very customizable if you know a bit on smarty and don't like the default look.
http://bcsengineering.com/store/dynamic-banner-scroller-for-x-cart.html
We have a client with a really nice example with the look tweaked just a bit to suit their look and feel. Contact us if you want to see it and we'll ask permission of our client to show it to you.
Thanks,
Carrie