Well, I currently have five 7-strings... unfortunately I know at least one of my guitars have to go, I'm having trouble deciding which one.
Basically, the S7420FM is one of the best playing and sounding ones I have, yet also isn't really worth a lot on the open market, so it's not even worth it. The 2027X is amazing and I think it's a keeper. Same with the JP7. That leaves the K7 and UV777BK. Despite the infamous inlay, the K7 easily sounds better and plays just as well as the UV - a unique sound. The UV777 of course plays like an utter dream, looks probably the coolest of all of them, has a great tone... but I find myself playing it the least for whatever reason. Also, I'm leaning towards with the Universe because of its enduring value on the open market. I think I could get more for it than any of my other guitars on eBay (or here...), with the possible exception of the JP7 which I like more (those pickups DiMarzio made for Petrucci are amazing).
I just feel like, perhaps the UV is the odd man out here, which feels wrong to even say. This is like "Sophie's Choice" here
EDIT: Argh, I'm sorry, damn duplicate thread.