Hi Dan,
Anything over about 10x is a bit unsteady for hand-holding, although lying back in your recliner makes it easier!
Orion have both 20x80's and 15x70's. (eg: see
http://www.bintel.com.au/Binoculars/...8/catmenu.aspx)
Their "Astro" series are their basic generic low-price binos: Celeston and others re-brand them too.
Much better quality, but also heavier and lots dearer, are their "Resolux" 15x70's. These are known as generic "BA8" binoculars, and are also re-branded by a lot of people including Andrews Communications (their "MB Ultra"), Williams, and even Astro-Physics.
If you want to go the whole hog and you have a very deep pocket, you could always try the Fujinon 16x70's (eg:
http://procular.com.au/fujinon-16x70-fmt-sx-binoculars/ )
All the best,
Dean