Boxer makes some solid mods. The 3D printed case and look are a totally subjective thing. Some folks love them, other don't. There's the new YiHi G Class, which I have no doubt is great at TC and has all sorts of features, but again, it's a subjective call on looks.
I got my VT75 on a great sale, otherwise I probably wouldn't have gone with that mod. I know there are a bunch of very happy 75 nano owners out there as well. I think cost should be a consideration in choosing, as at this price point you do want to feel your money is well spent. I believe you mentioned Vapor Shark as well, and they have a good reputation and deserve consideration.
I got my VT75 on a great sale, otherwise I probably wouldn't have gone with that mod. I know there are a bunch of very happy 75 nano owners out there as well. I think cost should be a consideration in choosing, as at this price point you do want to feel your money is well spent. I believe you mentioned Vapor Shark as well, and they have a good reputation and deserve consideration.