Format is one of the most loved portfolio builders among professionals and amateurs alike.
The themes look great and are very flexible but there's not that many of them, I guess they're going for quality over quantity here. You also get access to the theme's code files (CSS, JS and HTML) so you can tweak each theme as much as you like.
Proofing is available for the Pro and Unlimited plans. Speaking of which, Format is not the cheapest builder on the list but pricing is accessible, starting at $6/month for the 100 images plan, and going up to $25/month for the Unlimited plan.
For the cheapest plan you can sell 3 products, and the store supports physical products, digital products or services. Product options and shipping fees are also supported.
Overall, the editor is very well crafted with great accessibility and plenty of power under the hood.
Support is available 24/7 and there's a 14 days free trial available, as you'd expect.