I am looking for a few good trails in th 4-6 thousand feet elevation area of about 10-20 miles in length, not too steep.  I am training for a 20 miler in Bishop in May.  Any ideas?  Thanks.

I second that book, it is a good overview of the whole area.   Here is a link to a Cooper Canyon run on this web site. 

Link: http://www.mapmyrun.com/run/united-states/ca/alhambra/317055408

Cloudburst to Cooper Canyon Trail Run (10.32 mi.) Alhambra, California

 Also, depending on where you are coming from, there are good trials out along the Santa Monica moutains up the coast from Mailbu.