Is there a comprehensive list of RDS optics and their respective weights?

You could start a simple spread sheet and use google.

Red dots only? If you're worried about weight stick to Aimpoint Micros or the MRO, too rich for your blood? PA MD ADS or other Holosun T1 clones.

If low weight is paramount, the mini reflex red dots lead the pack. Most weigh under 2 ounces and maybe 3.5-4 ounces with a fixed mount.

The duty grade Leupold DeltaPoint Pro weighs 1.9 ounces while having a larger screen than T-1 and an unobstructed peripheral field of view.  About the same price as a T-1.  The less expensive Burris Fastfire 3 (about $200-$225) is even lighter, but not as well protected.  Still handles heavy recoil well, though (often used on 12 gauge shotguns).

Eotech 553 is 13.2 oz
Aimpoint PRO is 13.0 oz ETA this is with included QRP mount.and flip covers
Eotech 516 is 12.3 oz
Aimpoint Comp M2 13.0 oz, this is with QRP2 mount with 1/3 riser and spare battery cap w/ spare batt
Aimpoint Comp M3 10.9 oz, this is with LT 129 with spare battery
Aimpoint Comp M3 12.9 oz, this is with LT 129, spare battery, flip covers and Rubber cover.
       -I now run this optic without any covers! That stuff is way heavier than you would think!
       - flip covers weigh 0.6 oz
       - rubber cover weighs 1.45 oz

ETA

MRO weights
-bare = 4.25 oz
-Scalarworks lower 1/3 = 5.45 oz
-factory lower 1/3= 5.95 oz

The Scalarworks mount is extremely nice, I bought my MROs without mounts from Aim a few months back for a really good price. However, if I already had the mounts, I don't know that I would spend the extra coin to save a half oz. It is a very nice mount and is more aesthetically appealing than factory, but I think I could spend $150 on ammo or other go fast parts just as well.

Probably would have had more accurate measurements in grams, but this will get you pretty close.

Aimpoint M2/M3/Pro with LaRue LT150 = 11.05 oz (with battery but no flip caps or rubber cover)

Aimpoint M4/M4s with LaRue LT659 = 13.56 oz (with battery but no flip caps)

I need to weigh my M3 with Larue cantilever mount. Scalarworks is making an Aimpoint PRO mount, I am anxious to see what it weighs vs the QRP.

Its suppose to put it in the 10oz range.

Updated my post with more Aimpoint weights. I'll add a kill flash when I can find it.