I've got a vortex strikefire and burris fastfire 2. I actually like both for different setups. My strikefire is on my Colt 6920 and ff2 on my Ruger MK1. For a pistol, the ff2 or ff3 is my recommendation. It's extremely light and has plenty of brightness levels with a multitude of mounting base options. The strikefire is much better for a long arm; shotgun or rifle. The strikefire is just a cheaper aimpoint but it is very sturdy for the price. I'm thinking about adding one to a H&R Handi Rifle in .44mag for close range hogs.
I have a cheap ($99) EOTECH style red dot made by Sight Mark that i bought at academy. Im pretty pleased with it so far, also bought the 5X magnifier, which i didnt like so much, so i returned it.