[villagetinker]

Another thought, call SECO (or Duke) and ask them what the effect will be on your electric bill. They should be able to give you estimates based on different sized systems. As I understand it SECO has NET metering, and does not pay for excess power back to the utility. Now I am not sure if this is on a monthly or yearly basis. In any case, you want to size your system to match your monthly or yearly usage or slightly smaller. By up North, in the unregulated state of PA, your could put in larger systems, and the utility would buy the excess. As far as I know, if you do that here, you will not get paid for the excess. Double check with the utility to see how they settle the account, monthly or yearly.
Hope this helps.
Also, while I know nothing about Jack's Solar, per my previous post, double check the quality of the major components being used on your project. There are some sub par components that are still being imported, as well as some components from companies that have recently gone out of business (no warranty).