Is the Giotto known for needing especially fine grind?
The Breville seems to have mixed reviews out in the normal world, although they seem more concerned with the build quality than the fine grind issues so maybe check out what people think of it on here? I've got both Sunbeam EM0540 and EM0480 and both do fine for fresh beans as well as some Vittoria I got from COles for the people who think Nescafe is just fine.
I'm not sure what the 'Mod' is for the Breville but the only Sunbeam mod I have heard of is adding a shim to bring the grind level back from 2 or 3 to a more reasonable number so there is some play in the settings for different beans. And that is as simple as taking the top off and undoing one nut.
Give it a try and see how it goes - there is always Gumtree to sell the Breville on if you decide you want something better. And the money you get could offset the cost of a better grinder.