Much as I hate to promote the overall meander, I think it would lend well to this quilt as the piecing is so pretty the quilting wouldn't take away from it. Meander (aka stipple) is very easy and quick and very forgiving in placement so you can kind of just zone out in the quilting process.
In today's economy fundraising auctions simply don't bring in bids worthy of the item. I would hate to see you invest a lot more time and effort quilting this only to see it get a bid far far below it's value in just materials, let alone your time.