That's really a nice quilt - I would think those colors make it appealing to a pretty large group of customers.
The general formula for pricing (the last time I worked as a professional crafter or artist) was 2 or 2.5 times the cost of materials plus $8-10/hr.
$8/hr was a pretty good wage back in the 70's and 80's - it's only a little above minimum wage now, isn't it? You'd probably want to adjust that upward.
I don't have any idea how much people charge for quilts - having spent the last few years working at it, I think it should be a LOT. ;) But, in this economy, you don't want to price yourself out of the realm of possibility, either.