LBT makes great gear, although I don't have any. Of the packs you have mentioned that is the one I would go with.

I have had a spec ops THE pack for over a decade and it is still basically brand new, despite daily hard use. So maybe look into that bag if you like the look of it.

Also, Kelty makes some great packs for a good price. Their MAP 3500 pack was designed by a Seal team to be a tactical 3 day pack that didn't look too tactical. Some of the colors they offer it in make it look like a civilian pack.