I'm definitely not expecting you to end up finding 3 concept Vaders, though if it'd be great if you actually did. I'm going to assume that you won't though, so I'll keep looking myself.
Just finished opening everything up, and while Hasbro still hasnt perfected everything, this series is definitely a big step in the right direction. Here's my review for the F4 and the Surfer, will have reviews for the other four figures in a little bit.
Mr. Fantastic: In case you couldnt tell from the packaged pics, hes separated into two pieces in the package, and you have to connect the upper and lower bodies at the waist after taking him out. The head sculpt is the best one for Reed that has been made imo, but it seems to suffer slightly from being a little too pale, though it isnt nearly as bad as Quicksilvers. He is difficult to stand up, as the huge arms make him a little top heavy. In case you dont want a stretched out Reed in your collection, the flames on the Human Torch are easily removable, so it would just be a simple head swap.
Invisible Woman: Ive never really minded the Sigma 6 joints on female figures, so I dont really mind them on Sue. My major complaint is the head sculpt. While it does look feminine, it doesnt really look like Sue in my opinion, which is something that also always bugged me about the boxed set version that Toybiz made. I do prefer the new Hasbro versions face over the older version though. The face also isnt painted, but the shoulders and other parts on the body are, which slightly hurts the overall look of the figure. Other than that though, this is a solid figure.
Human Torch: While the hair does look slightly better in person, it still doesnt work for this figure. Ignoring the head, this figure is pretty great, as the body includes double elbows and knees, and doesnt suffer from a lack of a paint wash. The head though makes this the most disappointing figure in the series though. In addition to the hair, which is mostly bright orange with a nearly unnoticeable yellow paint wash, the angry expression of Johnny makes the figure look older than he should be. Honestly, the face sculpt looks like it would better suit a young Magneto than Johnny. As said before, the flames are easily removable, so you can easily modify it into a regular sized Mr. Fantastic if you so desire.
Thing: Pictures do not do this figure justice. While some pictures have made it seem like Thing is a solid bright orange, he actually does have a paint wash that really brings out the detail in the sculpt. In addition to that, his face sculpt is great, and is the best one yet for the Thing imo. Add that to the fact that hes actually in scale with the rest of the F4, and it results in one solid figure.
Silver Surfer: An incredibly awesome figure, and anyone who doesnt think so needs to get their eyes checked. The sculpt is beautiful, and the paint job is great too. Only complaint is that the board seems to get smudged easily when it is touched, but that is just a minor complaint.