[glend (Glen)]

When building a high end EP collection I believe time at the EP could be an important factor in determining what you want and need for the kind of astronomy your doing. Also, EP development is happening rapidly, just look at the choices in wide AFOV EPs that have emerged in the past year or so.
That 30mm Superview is a good start, it is well regarded and incredibly good value for money.

I'd suggest going to some Star Parties or events and having a look through a range of EPs in scope of similar size to yours. Given your location it might be worth considering coming along to the Star Party/Astro Camp at Lake Chaffey east of Tamworth commencing on the 24th of February through the 2nd of March (new moon weekend) (if that's feasible for you). Even if you can just get there for one night on the weekend there will be plenty of EPs to have a look through and I know there are a fair number of larger dobs coming along (at least one 12", a 14.5", three 16", as well as a larger CPC, various smaller goto refractors and newts. There will be a range of Televue EPs there, other high end EPs, as well as at least one Paracor, many barlows, and other goodies.

Finally, it might be worth talking to IIS member 'glenc' who is up your way (Casino I think), he has a 16" dob.