FT: FTL Smorgasboard

Recently several different concepts for means of FTL travel have been
batted 
about, and I must admity I've enjoyed it.  At least 2 different methods 
struck me as at least plausible, whether or not they're actually
attainable. 
  For that I thank the list's resident science whizzes.  Just a quick 
observation & question:

Most Science Fiction backgrounds takes one of these methods of FTL
travel 
and base an entire naval & commerce culture on it.  Has anyone ever 
cotemplated a fictional background where 2 or more of these different 
methods are ALL available?    Each method has it's own particular 
technological requirements, benefits, drawbacks, etc.  How would this 
variety of choices be viewed by ship designers?  I'm guessing that
different 
methods might be attractive for ships designed for different purposes 
(Naval, commercial, private/luxury, pirates, raiders, smugglers, etc.).

There's the ball.  Run, list, run!

3B^2

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