Don't base a purchasing decision on IPv6, it's too far off to be of any concern, and certainly not within the lifespan of a DLink product. I have an IPV6 tunnel set up on my Apple router, and while it works, there's precious few websites that support IPV6 currently, so it was mainly done as proof of concept for myself.
It remains to be seen too how ISP's will implement IPV6 to the home - I bet they will use Teredo as a first step, in which case you don't need IPV6 network gear at home at all for your IPV6 capable hosts to reach IPV6 sites.
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-Scott
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