Bosch self cut every time. you can frop on them cheap enough on amazon. Get a set of them by all means then you will have a variety, but I only ever carry 25mm normal, 14mm and 25mm long. Never really find myself needing anything else when it comes to holes in wood for cables.
Edit: oh and cheapo 20mm flat bit just for hole in plasterboard when you are surfacing something in YT2. 25mm can be a bit big for that and leave a bit of mess on show.