This may be a bit of a varied thought on the forums, but here it goes:
What good is a bike that sits and never gets ridden or only gets ridden once or twice a year?
Different types of bikes for different riding purposes is a different matter; i.e. a mountain bike, a tourer, a racing bike, etc.
I am not familiar with the Trek 950 or 6000, but if they are the same style of bike, I would get the 6000 and after half a year or more, if the 950 doesn't get ridden, pass it on to someone who can use a bike.