I kind of overdid it on the Guylian at some point, because they were always on sale at the local co-op. I did the same with Toblerone some time ago. These days I think I might prefer the Thornton's stuff, although I'm not sure if you count them as boxed. They're usually in bags, but sometimes you can get them in boxes, I think... but yeah, basically the truffles. Thornton's truffles are something amazing. The Viennese ones are my favourite. I don't have much chocolate these days so I don't overdose on them either, which helps me stop getting sick of any particular kind.