We simply don't work with designers who can't go from wireframe to PSD to fully-functional HTML and CSS on their own. There are simply too many designers who understand that HTML and CSS are not "coding," they're designing, and they're part of the craft.

For every ten good designers who are PSD-only, there are at least as many who will send you HTML and CSS and probably 2-3 who are capable of building a template in your framework/CMS of choice. My last subcontractor was a very good designer based out of Iowa who specialized in CodeIgniter templates. I've worked with similar folks who specialized in WordPress themes or in .NET Master Page/template setups.