We have an SEO optimised template/framework for v4.1.11 and shortly for v4.2. There's actually a style included similar to the Apple store uk, it's very easy to modify, you can have a complete new look in no time at all.
There's proper content ordering, it's table-less, 2 or 3 columns, HTML strict plus lots more...
More info here...
http://www.xcartmods.co.uk/x-cart-css-template-v4111-gold-pro-x-cart-mods-pr-52.html