.Not sure about the Top 5 rank but these batsmen were/ are always great to watch. Batsman like Don Bradman, Garry Sobers are great but I have not watched them playing live. Here's my list in alphabetical order:

Andy Flower
Aravinda D Silva
Azaruddin
Brian Lara
Gary Kirsten
Inzamam ul Haq
Mark Waugh
Martin Crowe
Mathew Hayden
Sachin Tendulkar
Saeed Anwar
Steve Waugh
Viv Richards
List goes on.....!