I agree. Considering that at my dealer a new 2009 black street triple is $9,699 (Canadian) I think $8,000 is too much for a bike with 16,000 kms. See if they'll drop the price.
Also, if you use blue book (
http://www.cbbtrader.com/values_trade-in.php?pid=383225) says the trade-in value at the dealer for a 2009 Street Triple is $6,200. The reason I mention this at my dealer uses a similar amortization system as Blue Book in determining its trade in values.
The blue book also says that a 2008 Street Triple has a range of values of $7,200 to $8,000 Canadian for what its worth. But this is for a bike in immaculate condition.
Hopefully that helps some or lends some perspective. Personally, I'd pay a little extra for the certainty.