2000 for 20in wheels is far from over priced. Vossen has a pretty good name for themselves, having owned a set before I can vouch for the quality. Heavy? They are 20's what do you expect? They aren't any more heavy then the typical 20's .. you want heavy, look at the weight of any chrome wheel.
Not to mention Vossen's customer service is pretty awesome.
This generation is not all that modifiable performance wise with the exception of the basic bolt ons, maybe in a few more years they'll have more parts available, but it's far from what other makes have to offer.
As for the pictures go, they look matte silver to me, the lighting makes them look off or something.