Jen,
There is a Mildura astronomy club, 'Oasis Stargazers Club' the not especially informative website is here:
http://mc2.vicnet.net.au/home/astrogroup/web/index.html
It looks like the person running it has recently changed as it was run by a friend of a friend, but now lists someone else as the contact. They have monthly public viewing nights. However, I have never got around to going along or joining (three small kids), so I know no more about it.
As for the best eyepiece for Saturn, I think I was saying the same as the others- there isn't one! When it comes to the planets you want as much magnification as you can, but the 'seeing' is rarely good enough for more than 200x (a 6 mm eyepiece with my scope), recently it has rarely been good enough even for that. Magnification is calculated as focal length of scope divided by focal length of your eyepiece (in the same units). e.g. my 1200 mm focal length scope with a 6 mm eyepiece gives a magnification of 200x (1200/6 = 200).