The original solar system selection process is documented here http://www.extremetech.com/article2/0,2845,2308674,00.asp http://www.extremetech.com/article2/0,2

The original solar system selection process is documented here http://www.extremetech.com/article2/0,2845,2308674,00.asp http://www.extremetech.com/article2/0,2845,2308674,00.asp and covers details like the up front costs