I always steer in this
http://www.junolighting.com/productguide/692.pdf direction. Feed with flex in my neighborhood, or romex in other parts of the country, has built-in romex connector. Best light quality, dual light level, low profile. I pay $50+ and $90 for 9-1/2" - 30" respectively. The side feed cord connectors allow you to cut across and reduce the quantity of your drops.
We come up off the floor 36" + 18" + 5-10" on the rough and tack up some cardboard. Then we poke our whip through at the center of the cabinet. This is for the drywallers. Then the carpenters slot the drywall down 5-10" to the proper height.
