After months of pondering, my holy grail would be an unissued or 'excellent' condition No1 Mk3 that saw service in WW1 .. complete with volley sights.... all matching of course !
If it had actually been issued and used in WW I, it would NOT be unissued or excellent condition. Best hope for one that is in original condition and is still presentable. Besides, those battle scars would give it history and a true "pedigree."