IMHO if you want to get the best money for them, put them on ebay. If there's a minimum amount of $$ you're willing to accept, post them with a reserve price. You can always link your auctions back to the threads here for folks that want more info.
But if you genuinely care about who's going to be getting the system and what they do with it (which it seems like you do), and that it's not going to go to some hoarder or collector who will never even use them, keep them for sale on here. And kudos to you for that!
