Really as these guys have said, what your goals are for the amp is a big factor. For bedroom / recording, the VII is very good, has a ton of tonal options & modern features. How does this rate to you against having the feels? I will say the VII has a pretty legit liquid lead sound and could make a guy very happy if the amp never leaves the house.
However, when you A/B the VII against a II, III or IV, the VII in comparison feels like a modeler in that the wall of sound is 2D and it doesn't command the movement of air. The volume is there, but no push. Is that important to you?
In the live band the IV is IMO one of the best Marks there is. That's important to me, and playing live is ultimately where the VII lost my interest due to the soft, mushy (relatively speaking) attack. The forward edge of the notes just smear in a way I did not care for when the whole band was at volume.
Long story short, definitely NEVER sell an old Mark to fund a new one. You have to find a way to get them both in the room & see which you prefer. I know guys that truly prefer new vs old even though I prefer old vs new so that's all good- you have to experience it for yourself. It would be a huge regret to sell an old Mark & then realize you effed up.