Yeah, the 6000 is discontinued. For a price comparison, you would look at the SL-C1000+wifi card:

$381 - http://www.pricejapan.com/PriceJapan_com.htm
or
$406 - http://conics.net/shp/pda/zaurus-sl-c700/index.html

Then you would need to add the WiFi option in the CF slot for another $50 to $100.

The Zaurus ends up being a bit more expensive, but you do get the built-in keyboard and 400mhz processor. The 770 has the nicer screen and form factor. It all depends on your needs.

I really do think the Nokia is an excellent device....and I'm writing this post from mine :-)