PV Prices and more conservation

array.xlsx I see PV prices are trickling down. Possibly getting close to the point where they are affordable. The spreadsheet has several "kit" prices listed.
I am seeing prices just over $5 a watt for the complete kit. Installation adds around $1 - $1.5 per watt to the total – so DIY will save about $3K - $4.5K. The trick will be getting the permit, inspections, and sign-off for FPL to hook up the net-meter. I think getting a qualified electrician to complete the hook up should cover the paperwork for FPL and any rebates.
While figuring out where the price reductions will meet my available funds and incentive packages I am working out where I can cut requirements. I looked at radiant barrier foil for my Florida attic – it gets to 130 degrees up there. None of the major hardware stores carry it, and it is $75 for 5 squares – so I opted for an attic fan. Total cost $70 and about 5 hours to install. If it helps cool the attic and cut the AC drain by 100Kwh per month that would equate to 1Kw of installed PV. (1Kw x 5hrs/day x 20 good days a month). We’ll see.