I used to use Squarespace but switched to WordPress with a grid server web host (http://www.simplexwebs.com/ http://www.simplexwebs.com/) and I'm using a heavil

I used to use Squarespace but switched to WordPress with a grid server web host (http://www.simplexwebs.com/ http://www.simplexwebs.com/) and I'm using a heavily optimised framework called Thesis (http://jonnyrowntree.com/thesis http://jonnyrowntree.com/thesis) I also use CloudFlare have found that it loads my website faster and has doubled my traffic on most days. I'd recommend it, even if you have a fast server.