A good dynamic range depends on what you intend to photograph. If landscapes and outdoor photography are your jam, then a good dynamic range should be at the top of your priority list.
High-quality digital bodies have a range between 12 and 15 stops at base ISO levels – but some of these are incredibly expensive.
A range of between 10 and 13 is ideal for most photographers – plus with the hacks discussed here, you can optimise the outcomes anyway.