I used XArt not too long ago and for Bartender you need to use about a scale of 90% and padding of 3 on each of the two bars you'll place in the center. I think that was my settings for them.
/bar bar1 scale 90
/bar bar2 scale 90
You could probably go a tad smaller but it only accepts increments of 5.
/bar bar1 padding 3
/bar bar2 padding 3
If you need more bars my advice is to put them on the right hand side like Blizz's defaults do.
I always use simpleMiniMap, Prat for the chat boxes and on the right hand side by the minimap I used simple combat log. you could also use SW STats there if you wanted. Just turn the transparencies way up on the aspects on it so it blends well. Not sure if I have screens, if I do I'll post em.
I guess I do.
And I was wrong, I used SW Stats on the left in these screens.
http://s63.photobucket.com/albums/h1...rrent=Zoo1.jpg
It's even during the Highlord Kruul event on my former server, what a treat.
http://s63.photobucket.com/albums/h1...rrent=Beg7.jpg