what fruits do best in an elevation of 4900ft above sea level onwards?

Answer 1

Peaches are grown in the Great Basin of the western United States, which is over 6000 feet.
http://www.nps.gov/archive/grba/treesshrubs.htm lists a number of berries which grow in the Great Basin.
Google 'high-altitude fruit growing' for a number of returns
including http://www.flagteaparty.org/GrowingFood/GFPages/Chapters.html

Answer 2

coffee