I have a Holosun HS403C that I like a lot. It has a 2 MOA dot and dual power (solar cell and battery), and 50,000 hour battery lfe. The cost was around $200. I lost a battery tray screw and Holosun sent me a complete new battery tray assembly with screws for free. Good product and a good company.
I also have a Vortex Crossfire CF-RD2 2 MOA red dot, also with 50,000 hour battery life, but no solar cell. It was around $140 and is also a good optic for the money.
I also have several Aimpoint red dots. You can't go wrong with Aimpoint, but you will pay for it.
For reflex red dots, I really like the Burris FF III and the Leupold DeltaPoint Pro.