No Donald on the poll?
I refuse to vote in protest.
Anyway, presuming this is purely about Tests...
A top-five for me would look something like:
Donald
Ambrose
Wasim Akram
McGrath
Pollock
And when you're leaving-out from a top-five luminaries like Bishop (who took 137 wickets at 22.18 between February 1990 and June 1997 - and lawd know what that'd have been but for serious injury), Warne (289 wickets at 22.55 between Feb 1993 and Feb 1998), Walsh, Waqar Younis (166 wickets at 17 in 26 Tests between October 1990 and September 1994, then 75 in 17 at 24 between July 1996 and December 1998), Muralitharan (146 at 23.25 in 25), Kumble (163 at 21.35 in 29 games in India) and several others you know it was a powerful time for bowling.
And when the likes of Angus Fraser, Paul Reiffel, Andrew Caddick, Craig McDermott, Dion Nash, Merv Hughes, Simon Doull, Chris Cairns, Darren Gough and Javagal Srinath are left looking second-string, you know it even more.
What's more, you can only wish the likes of Bruce Reid, Jason Gillespie, PS de Villiers, Damien Fleming, Heath Streak and Craig Matthews had played rather more than they did.