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@cjpwood: your website looks very good. I am about to build a website for a jewellery shop so its good to see one done well with Magento. Just to point out tho, there’s a typo in the link to the sister site under the heading Welcome to Iconic Watches.
You can have a look this Improved Layered Navigation extension.
Let the customer filter products by color, price, manufacture, any product attribute. Place attribute filters on any store page. In fact, the extension functionality is impressive and combines 6 mods:
Seo layered navigation
Shop by brands
Ajax Layered Navigation
Layered navigation filters
Advanced categories menu
Layered Navigation pro
Price sliders and other numeric filters