I would recommend you look at the new reBOOT template
http://forum.x-cart.com/showthread.php?t=66570
It's a responsive template and easy to modify. I've been tweaking it since it came out and I'm about 95% there. I'm also customizing a responsive Wordpress template to use as my x-cart blog for when I go live with reBoot on 4.6.x and have it seamlessly integrated with my reBoot template design. Visitors won't be able to tell that they are switching between x-cart and Wordpress.