Just go with the fans you like best, as long as you go for ones with decent specs any fans will do. Best fans for cases ar ones with as high of a CFM you can find with the lowest DB.
The higher the CFM the more air they blow, but you don't want to stick ones that sound like hoovers in your case so find the quietest one with the lowest DB.
Off the top of my head The Corsair AF or Cougar Vortex fans would be good choices.