I'd personally use Magento instead of Shopify, it's way more affordable other than the hosting costs. it's 100% free and open source. so if you are like me a computer nerd then I would totally go with Magento.
And in case you are a pro, or an established business going with Magento instead of Shopify makes best business sense.
As @afree said, you may then incorporate both Magento (or your favorite e-commerce solution) as a sales front end alongside Clickfunnels as your backend sales funnels platform.
Hope that adds any value.