Carl,
Compared to your small reflector, some money spent on a bigger aperture scope will produce far better rewards than money spent on eyepieces.
But first, go visit a local clubs observing nights to see what others are using and sort out what your interests are.
When the time comes to buy you can do quite well buying a dob secondhand and you may find one that comes with some reasonable eyepieces; I'm sure most selling a dob would happily throw in a couple of decent older ones such as plossls, Celestron Ultimas or Vixen LV's with it if you asked.
BTW check out the eyepieces at
www.andrewscom.com.au, many there well within your budget.
.