I think CK was right earlier when he said it's a balancing act between all the different factors, and therefore in some basses the wood used for the neck will have more or less of an effect on the sound - and to be fair, I think even ARGH recognises that different necks will affect the sound differently (as with Graphite necks, as he pointed out). He just seemed to suggest that the difference was negligable.
So I think we can agree that there is an objective difference that differs from bass to bass but that the importance we place on it subjectively will also differ from person to person.
Now, back on topic, I've never tried a Jazz with a wenge neck or a Warwick with a maple neck, so I don't know what kind of difference they'd make to the balance of the sound but, if you want to hear what a wenge neck sounds like, try out a Warwick, and if you want to hear what a maple neck sounds like, try out a Fender/Musicman. I think the comments above provide a helpful rough guide though: maple = bright, clear, defined; wenge = growly, meaty.