I dont know Beenleigh but Bendigo has a lot going for it at the moment.
Great rental yields and very low vacancy rates. An example is Golden Square, a great suburb on the south-western edge of the CBD that is quite popular with families, it has a vacancy rate of 0.5% at the moment and yields are 5-6%.
With a shortening time between Melbourne and Bendigo, increased investment in Bendigo (Bendigo hospital upgrade, state government departments moving there, etc) and a great self-sustaining economy, along with a small entry price - it makes for good buying.
Bendigo reminds me of Frankston market 5 years ago, and I think the fundamentals are there for a boom.