Good advice given above. Check out your local gun stores and look at (and through) the different optics within your price range.
Over the years I've owned numerous Aimpoints, Eotechs, Trijicons, etc.
While Eotechs have that wide FOV through the optic & circle-dot reticle, controls are un-ergonomic, battery life is relatively poor and they have more reported problems (wandering zeros, battery drain while off, delaminating HUD's, loss of nitrogen purge, electronic glitches requiring battery removal to fix, etc).
Aimpoints are excellent. Period. The Pro is a great value if you don't mind the greater size/weight (compared to their Micro line), Micros if size/weight are important (but you have a more limited FOV through the optic as well).
Trijicon DI optics are very tough/KISS, but an older tech that can cause reticle washout under certain lighting conditions (like aiming from a dark room out a window into bright sunlight or when using a bright taclight at night at close range).
Personally, I've been using several of the Meprolight RDS' for over a year and really like them: Eotech-style wide FOV through the optic, 15K hrs on a single AA lithium battery, integral QD mount, lighter than the 30mm Aimpoints (but heavier than the Micros), simple/KISS control (Off, High, Medium, Low, NV) and a motion-sensing auto-on/off feature that turns the optic off after 30 minutes of no movement yet turns it on again w/the slightest touch. IIRC, Amazon is currently selling these for $310.
HTH...
Tomac