So it comes down to if you want: MF8 Master Kilominx and a Mini Dayan+MF8 4x4; a Shensghou 8x8; or a MF8 Master Kilominx and a Big Cubesmith order; because you have a Guhong V2 and an MF8 Gigaminx in each option.
I heard the Mini Dayan+MF8 4x4 isn't as good as the regular sized one, but don't take my word for it. So if you need stickers for a lot of puzzles, Option 3 may be the best route; but if you don't need that many stickers, and you don't mind not getting a Kilominx, Option 2 might be the best option.