I'm gonna include anyone who bowls usually in the mid 80mph or below.
I would have as a top 5:
1. McGrath - taken most wickets as a pace bowler in test cricket.
2. Hadlee - superb accuracy and a wicket taker.
3. Bedser - was a challenge for Don Bradman.
4. Pollock- underrated. Has taken close to 400 wickets at an average close to 20. At one stage he averaged under 20.
5. Botham/Dev - Both took a lot of wickets and could be devastating.