I would recommend that you go for it. It sounds like you will enjoy having it, and maybe even get more use out of the boat given the added convenience.
It may or may not increase your resale value noticeably, but it will certainly be a plus if someone is comparing one boat with and one without a furler. And for some buyers the absence of a furler is a non-starter.
Like Sailingdog mentioned, you'll either need to get a new headsail or modify an existing one to work with the furler. This is where a consult with a reputable sailmaker might be worthwhile -- they can sometimes offer a package deal on the hardware and sails.
I would think the combination of a new headsail and furling unit would be a plus when it comes to resale.
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT