[racket] (define best (compose car sort))

You probably want to consider space efficiency in addition to time 
efficiency.  For example, why store O(n) if you only need to store O(1).

Also, when you time some code, you generally want do 3 "collect-garbage" 
before starting, or GC due to other code might be throwing off your 
numbers.  I also like to do 3 "collect-garbage" after the code being 
timed has finished, and look at how long the GC took, and whatever 
metrics the GC gives for what has been reclaimed.

Neil V.