It seems to me this thread has thrown up an interesting cross section
You May get a CSV who is Ball/toy driven
You May get one that is Food driven
You May get one who is Shy
You may get one going to work
...or you may not
I (possibly becasue I am a trainer) see all dogs as trainable, however with some breeds (or even individuals) you have to think outside the box. Finding your dogs 'on' switch is always the first (and sometimes most challenging) part of any training (finding an 'off' switch is another!!).
So I guess it comes down to the kind of trainer you are, how much of a challenge are you up for and how much are you willing to change your training ideas to suit the dog? as opposed to trying to change the dog to suit your ideas?
(this is my overall impression from this thread - so far
)