Anova tends to be one of the leading brands as far as sous vide machines are concerned, and their AN500 range is a popular choice. Much like the Breville option above, this Anova sous machine works through an app, with the added bonus that you can access all kinds of specialist recipes before you start cooking.
This single immersion circulator, which you can attach to a pot or container of your choosing. The system is much more affordable than the Breville model, but a little chunkier. It has a temperature accuracy within 0.1 C either side.
Check Price