Nice idea, Ganga. Other than that, I'd say don't go for rare, get something good. Something that most people talk well about. But also something good that won't necessarily be on the shelf in ten years. Not limited edition, necessarily, but one of the more short-term labels. I'd worry that something that's rare and expensive now, will be more so in many years time, and won't be something your kids would want to crack open. To me, that pushes in the direction of selling at auction, and it sounds like you want to leave them more options.