Sharks or the Bulls. WP are too much of a wannabe team and Cheetahs don't have enough star players/experience.
What do you mean by the Cheetahs don't have enough experience? I mean, they are my team, and I do think they are the underdogs and they definitely don't have the amount of Bokke the other teams do, but ...
http://www.rugby365.com/tournaments/cc/news/2649561.htm
2000:
Natal vs Free State Cheetahs, 29-15 in Durban
Western Province vs Golden Lions, 43-22 at Newlands
2001:
Natal vs Golden Lions, 16-9 in Durban
Western Province vs Free State Cheetahs, 40-18 at Newlands
2002:
Blue Bulls vs Natal, 22-19 in Durban
Golden Lions vs Free State Cheetahs, 43-29 in Bloemfontein
2004:
Blue Bulls vs Golden Lions, 40-33 in Pretoria
Free State Cheetahs vs Western Province 17-11 at Newlands
2005:
Blue Bulls vs Golden Lions, 31-23 in Pretoria
Free State Cheetahs vs Western Province, 16-11 at Newlands
2006:
Free State Cheetahs vs Sharks, 30-14 in Bloemfontein
Blue Bulls vs Western Province, 45-30 in Pretoria
2007:
Free State Cheetahs vs Blue Bulls, 11-6 in Bloemfontein
Golden Lions vs Sharks, 19-12 in Durban
2008:
Blue Bulls vs Free State Cheetahs, 31-19 in Pretoria
Sharks vs Golden Lions, 29-14 in Durban
2009:
Free State Cheetahs vs Sharks, 23-21 in Durban
Blue Bulls vs Western Province, 21-19 at Newlands
2010:
Sharks vs Blue Bulls in Durban
Western Province vs Free State Cheetahs at Newlands
I just think, in my personal opinion -- underestimate the Cheetahs at your own peril.