I have Ameriglo sights on the wife's PX4 Storm and they are nice. I am a big fan of the TFX Pro sights though because you get the best of both worlds with them. The open area, above the fiber works great during the day to make the sights really shine bright, and the tritium inside is good enough to see well in low light conditions. I only have one set of Ameriglo sights on a pistol, but I've got 3 sets of TFX Pros on most of my other pistols.
I really won't say you'd be upset getting either one of them.