Lots of good red dot choices out there. Aimpoint on the higher end, Sig on the more economical end. They both have great battery life. I own both and would recommend them.
If needing some magnification I would stick with a true 1x at the bottom. There are too many to list, but for higher and lower price points I have XTRII and Khales 1-6.
Edit: for USPSA PCC I use a C-More and have no need to use anything else
I feel the two key items are durability, and battery life. I use the MRO on my Rattler for these purposes. Battery life should be leave it on at all times type good
I think a number of great posts. This rile gets a lot of recoil, from my experience. I would keep it low and tough. Aimpoint T2 or CompM5 (better) or the Elcan (any of them) are all great choices.
We have a number of options in stock, if interested.
I’m using an Aimpoint T1 on my MPX. It’s hard to beat for size/weight, battery life and durability. You can usually find good deals here or on M4C for used Aimpoints. I have bought all of mine used with no regrets.
I just recently sold my Aimpoint H-1 in order to purchase a Leica Tempus red dot for my VZ-58. Much better upgrade IMO, the Leica has a smaller footprint and is lighter. The Aimpoint has better battery life but that is about it.
It's a heavy bastard, but man it shoots smooooth. No idea about the recoil comment a few posts up, mine runs like a .22LR. Fixed irons means I don't have to worry about turning the sight on in a pinch, and its got a light so I am covered. Rattler below runs the battery free mini ACOG.