So long as they are IDPA legal, it's all good! I use the stock 3 dot. Sometimes I black out the rear dots. Any sight that lets you clearly see the front site will serve you well. Certainly a bright fiber should work well.
That being said, have you tried to shoot a match, or a dot drill, with the standard sites. You may not really need a new set. After all, the beauty of IDPA is its aversion to equipment upgrades. However, pimping one's pistol to make it unique is certainly an admirable thing.