You could install the system yourself and save 50%. I took the solar/wind course at Frostburg State University in Maryland. At the time is was just $750 for eight weeks online with a 3 day lab. After the lab I passed the national exam. I can do it myself for $3.50/watt before incentives for a grid tied system.
My current incentives include Maryland = $10,000, County = $5,000, plus Federal Government 30% of the balance. That does not include the $1,500 annual savings on the electric bill or the check for selling the energy credits. I expect my payback in less than 4 years.
UL certified panels are available online for around $2.00/watt. The classes are open to everyone. Its 8 weeks online and 3 days in class. I was quoted $10/watt in the DC area for a system. It will save me $40K-$50K.
Good Luck.