Other Gorilla & Ohm Class packs?

I think those are the two choices I would consider if I were to buy a pack with those specs today, but I would also consider frameless packs, if you plan on only carrying 25 lbs occasionally, 14-18lbs regularly. These might include Ron's MLD Exodus/Prophet, some of the other Gossamer Gear packs.

If frameless is not an option, I know the Osprey Exos 46 at ~30 oz is another popular option in this range.

I've noticed a lot of people and resellers quoting incorrect weights for all 3 models of the new Osprey Exos packs. I believe that the preproduction packs weighed a little less and that Osprey put out numbers that were lower than what the actual production pack weights came out to. The actual weights published on Osprey's website for the Exos 46 are:

S – 2 lb 3 oz
M – 2 lb 5 oz
L – 2 lb 7 oz

So while I agree they look like a great internal frame pack, they aren't quite as light as the numbers that are being thrown around. The Exos 58 ranges between 2 lb 7 oz and 2 lb 10 oz. The reports i've seen of users actually weighing them indicate they seem to be close, within 1 oz of the published numbers.

in size large (according to the digi scale at my office).

I can report that the Exos 46 in medium was at the stated 37oz. And the removable lid is ~3.75 oz if you don't need it.

I think you've summed up the market for framed packs at 24oz. Six Moon Designs makes a couple that weigh 29 (Comet, on sale) and 30 (Starliite) with the optional stays.

The Granite Gear Virga is rated for 20 lbs, but ratings can be subjective.

Granite Gear Vapor Trail @ 37 oz also fits the bill, although the weight is high. There has been some discussion as to the accuracy of the stated volume though (3600, sehirment being that the number is high), but no testing to confirm volume.

Six Moon Designs Comet