I would have to agree with you, i'm also holding out for VI, as difficult as that may be, especially after all these shiny photos.
Here's my reasoning.
IV looks awesome.
If you're a completist, then IV is a must purchase.
Unfortunately for me I can't afford to be one.
Therefore I can only afford one IM to go along with my WM.
It only makes sense to go with VI since VI interacted with WM in the movie.
If the end battle had been with IV, then IV it would have to be.
I just wish that VI was as shiny as IV and also had a full Stark head, donut I don't care so much