Well, it's probably not exactly what you're looking for (since it's a homebrewed magic item, and has never been priced out or anything), but there's a magic item that keeps popping up in pretty much every campaign I run- it's a magical bow called Tharalar's Fist. A friend of mine DMed a game that I was in, and someone in our group came across Tharalar's Fist- and I thought it was such a cool item, that in most of the other campaigns I run, someone ends up finding Tharalar's Fist, or some connection to it (in a one-shot I ran, a ranger in the party met a tailor who was talking about his son, Tharalar, who had just left to become a ranger). So, for me, at least, it's got value beyond just its stats.
Anywho, Tharalar's Fist is a magical Longbow that deals a d10 base damage rather than a d8 for a medium sized character, and can be used with any Strength bonus. So a Rogue with a 12 Strength could use it and deal 1d10+1 damage, whereas the Barbarian with a 19 strength could use it the next round and deal 1d10+4 damage. (He could even then rage, and deal an extra 2 damage per attack.) It's pretty simple, but if you add some flair in its description, it can be that much more interesting. (I gave it to an NPC in one campaign I ran, and this NPC had a ridiculous strength- like, a 28 or something- and when he pulled the string back to fire an arrow, I described the bow as looking like it was warping reality slightly as the arrow got pulled back with such an impossibly strong pull.) And, of course, you'll probably want to toss on some enchantments (at least +1), too.
However, I have no idea what sort of a cost it would have. It was given as a gift in the first campaign I was in, and it's been given as a gift in all of the campaigns I run. So I've never really needed to price it.
Oh well, just thought I'd mention that.