Given what you guys do, I'd definitely go for Xtreme Pro - a lot more design tools and better layer management.
Good job on the sites. The Red Barn site, I have two comments on:
Opening page - not sure if it works, but I know where you're coming from! A bit too much of a clutter for my liking.
Your pages have a zig-zag effect in their design that I think is a little untidy. I'd suggest moving your right hand panel up to the top right to bring things into line.
All in all, really good work - a nice business!
Welcome to the world of Xara!
Paul