Geez, an Aimpoint PRO is $400. If you're planning on shooting under 100 yards all of the time, it's a great option and is practically bullet proof. It's great for 16" or shorter carbines.
For my uses on a 223/556 rifle its Aimpoint hands down. I can get good hits at 300 yards with my H-1 with a 4 moa dot. Anything past that and I have trouble seeing what I am shooting at. Realistically the furthest I would ever shoot is about 100 yards anyways because thats about as far as I can see on my property. I dont know where people get 'red dots are only good for under 100 yards' or whatever other bs they are spinning.