You get what you pay for. For my system I used BP585 panels. These are not cheap but offer the highest power per area of all the panels. BP Solar gives an ideal power output of 85W per panel. The state's real world output is 78.1W. This ratio is actually excellent.
Most panels are much worse.
My inverters are very good and have efficiency of 95 percent. Good inverters are a lot cheaper than extra solar panels. Don't skimp here. Again, the CEC calculates rebates on the power that can be input to the grid. Buy quality components.