Shofu Vintage Halo. I would say Vintage, but for bridges, you will get the occasional cracks on bridges, but not so much with Halo. I like it in that it is a "medium" opacity porcelain, and is pretty forgiving. The Vintage MP paste opaques are pretty nice. You could do your opaque, a ging. body 1/2 step darker, then overlay the Inc with body 1/2 step lighter. Layer the standard Inc over it, and get a nice real close shade result. You could also use the Opals on anteriors - 2nd Bis (maybe go 1/2 shade lighter than the book, as I think they tend to be a little lower value compared to the standard Incisals) and use the standard Inc on the posteriors for more opacity and brightness/contrast. The standard Inc is also cheaper.
I'm not a fan of the MP porcelain. Because I use a wet tray, I've found that if the porc. stays wet for days on end (I have shades that I always keep on a wet tray, just replenishing them as needed) I would get a gray hue to them after they fired.