1.52kW fully installed system Solar power system from $2500 (or possibly free)
Includes pretty much everything, but there may be some extra costs depending on your house. In my case I have a double storey (+$200) plus flat steel roof (+$415) so it cost me a little more. Depending on supplier, you may also have to pay for a "smart meter". Even so I calculate that with the Solar feedback rebates (I will be credited back about three times the market rate for any energy I generate and feed back into the grid) in Melbourne I'll pay for this installation within four years. So that's a 25% tax free return on investment. If you combine this with the interest free loan noted at http://www.buckscoop.com.au/forums/freebies/17923-free-sustainability-assessment-interest-free-loan.html then you effectively will get the solar system for free (in fact you could possibly install a larger system), and after it has paid itself off, you will continue to get credit for years to come - these systems have a lifespan of +20 years....
I ordered my system in mid Dec, and it was installed mid Jan.
Basically - after four years, cost neutral. From then on I should be saving around $800 per year - and that's at current (pun intended) power prices.