Forgot to mention some good quality "budget" red dots. Bushnell RXS-100 is available now for ~$100. J-point/DeltaPoint/Shield foot print. Nice small flat-blade screwdriver (included) click adjustments and the battery can be changed without un-mounting it -- a nice "side door" compartment holds the battery. I believe it may be discontinued and its replacement is over $200 (better battery life, more brightness levels). Also comes with a rail mount if you end up not liking it on you pistol.
Another recently reduced in price is the SIG Romeo Zero, currently about $150 if you shop around. Also J-point/Shield/DeltaPoint footprint. It is one of the smallest on the market, which is nice on a carry gun, but the downside is you have to remove the site from the pistol to change the battery, and the adjustments are not easy -- no clicks, and you need an 0.050" hex wrench (supplied) to change them, adjustment range is not a large a my FastFire. It has no off switch, it uses some motion sensing to turn it on and it goes off with a few minutes of activity -- not clear how well this will really work out as you do move when you are wearing a carry gun! I'll know in a year or so as I've just mounted one on my new Hellcat, so far it has always been ON once I've picked the gun up, and is Off if I look before picking up the gun.
Can't comment on the Customer support of Bushnell or SIG for red dot optics. Burris "no weasel words warranty" was honored for me when my first FastFire died, they replaced it with a then new FastFire III without hassle. So in the ~$200 price range they are perhaps the safest bet, They use the "Doctor" footprint with is a bit longer and narrower than the others.