Welcome to Coffee Snobs Simon.
I have a Sunbeam Grinder that I used with the Sunbeam 6910 at work.
It produces adequate ground coffee but be warned its messy and noisy.
Let me state up front that at home I use an Expobar and a Macap grinder.
Both well above the budget you have set.
But Im not going to tell you to spend thousands of dollars to get a good coffee.
Would it be possible to stretch your budget to a Sunbeam EM6910?
Normal retail is $699 but Ive seen a few ads lately for them under $600.
The 6910 makes decent espresso and can steam milk simultaneously as they have an additional pump just for steaming.
They are easy to use and Sunbeam supply a free introductory course on how to use it.
The course is well worth taking according to all the feedback here.