This is mine, on ebay but will pull and sell @ discount to fellow ZGGTR''r for $650 + actual shipping.   It's the 478 with a 512MB data card, XM receiver, car/boat/motorcycle cradles/mounts AC and DC power, lots of stuff.   I've got $800 tied up in it over the last two months, it's a superb unit but actually more GPS than I need, it's an Ironbutt'er/rally rider unit, I'm getting something simpler for my casual interstate riding.

Paypal preferred. 

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=140756068869&ssPageName=ADME:L:LCA:US:1123