For me it's Joe Lauzon, because Lauzon leaves every fuck he has to give outside the octagon and he has that true warrior spirt. 
Nick he's given me so much entertainment in and outside the cage over the years. 
Mirko Crocop Filipovic!!!
Hendo
Two ... Donald cerone and Matt fucking Brown. Everyone else can go scratch
And because of there style love the Dutch style striking and slick underrated ground games
Me. I'm the man.
Tom Lawlor - Me. I'm the man.Filthy bastard !
Randy Couture. Has an underdog ever won more consistantly?
My og top 5 is mostly retired now
Vmat
Bartimus
Randy
Mir
Leben
I know odd list but shit i could have ken and tank on there too .
Nowadays Ill take lawler faber or moraes now ok and nick newell fuck i cant choose just one lol
Andy & Chuck are by far my fav to watch
If I have to pick a current. ..maybe Cub Swanson
Saku, hands down was my favorite of all time
Cerrone lauzon McGregor
Diaz brothers. Always an exciting fight. Love the volume striking style.
Cain, because hes the best and not an arrogant ass. He goes in there and overwhelms his opponents.
Igor Vovchanchyn. Demolished guys much larger than him. Super fast and powerful in his prime, warrior spirit through and through. I will always be a Igor fan.
Jacare.
He makes grappling look easy.
I love seeing him preform.
The way he holds a sweaty man down forcing him into a submission.
(Beep!)
anderson silva, grew up watching bruce lee and he always reminded me of him
Her dad.
Cain
Nick
Robbie
and as far as guys who also kick:
machida
pyle