This is a great set of maps, right down to 40 ft contours. I started with the TOPO! Yosemite and Sequoia.  But the TOPO! California adds shaded relief, which improves map readability both on-screen and printed. Plus to go from Yosemite to Sequoia there is no switching between CDROMS.

Print your own custom maps with National Geographic Adventure Paper

This is great map paper for home printing, and better than USGS map paper. The paper resists folding, staining, wrinkling, and moisture. Excellent for the backcountry. And you can always make more maps.