Hi Carl,
Please email me at andrew@writeonweb.com - I can help you with some if not all of your current needs that you listed in the post. I'm a CSS3 wiz + have a strong design sense as well cross device, and can work with bitmap and vector type imagery with ease. I'm doing something similar for another client :-) I too am looking for longer term relationships with clients as well as it's a win win for ongoing minor or major updates. A relationship derives familiarity with both people and business and technical subject matter, design, templates, code, etc - all of which ultimately saves time, allows for faster implementation, and saves money.
I'm a Shopify Partner, with extensive experience in the Shopify platform along with HTML5, JavaScript, and CSS3 cross device and browser display issues. I can navigate any custom development code relatively quickly, and help you in the long term as well beyond display issues including data, Shopify template logic, JavaScript, JSON REST Service based Ajax integration, etc.
Best!
Andrew (Seattle based :-)