What is a good asking price for a 2006 Dagger Juice 6.9 that is in excellent shape. Is $400 a good price?

Not sure what that would be in Aussie dollars with current exchange rate but that's cheaper than i would sell mine for.
But it depends on the condition it's in.
When you say excellent do you mean not a scratch or just no gouges and dings?
How often paddled?
Is all outfitting in good shape?

I know that for mine I could probably only sell it for $500AU (which is probably less than yours) but to me it's priceless and I never would sell it. Mine has a ding in the tail and plenty of gouges though and the air pump don't work no more and the backrest is tied together rather than buckled because of a near death experience a few years ago that shattered it. ( only the rocker on the nose and some real quick prayers saved me.

Overall if yours is in excellent nick I think thats a bargain price. While they aren't a new model they are still an excellent boat with a very comfortable outfitting system and in my experience dagger boat last a hell of a long time and cost around $1800 brand new. So half price for a second hand 1 yr old excellent condition great model boat sounds like a real deal to me.

but thats just my opinion:D

Go Dagger:D

Hope this helped in some way. I tend to a bit.