I'm really glad you started this thread, Leon, although unfortunately I don't have the perfect answer. I've been buying Impresso tags from the US (at silly cost in terms of UK customs and admin fees). I really like the way the names are 'engraved' so won't wear off, but the wires they come with are too flimsy. I'm experimenting with thicker galvanised wires, but don't have it right yet...
So I'm looking forward to hearing what people say.