In Australia we hold an event once a year called the Oxfam walk. Oxfam is an international aid organisation and as a fundraising thing each year they do a 100km non stop walk.
Its really quite inspiring seeing the teams come together and raise money for a good cause. Im sure in the States there is something similar you guys could do.
Another idea is an Advnture race. A TRUE adventure race.
Get a 500W PSU
Get an AMD FX processor entry level is like 100 bucks. (Aim for the 6100 if you can)
8 GB ram (Corsair Vengeance is my fav, the 1333mhz is only like $40)
A 7750 or 7770 vid card is only around $150 but will run Diablo smoothly and can be upgraded if you want to spend a little more. (7850 for $250/7870 for $350)
A simple 1 TB HDD or get a 60 - 120 GB SSD if you'd ra