Mk IV will cut your ears off with high mids.
Those amps are an exercise in compromise - spend some time with one and you will see. They have a ton of flexibility but the shared EQ and global functions really tie your hands when it comes to getting good sounds across all the channels...
And, as I said, it can be PEAKY AS HELL in the high mids.
For you Jacob, and keep in mind I've listened to a number of your clips through the years and know the kind of tones you go for... I'd probably recommend a newer Splawn Quick Rod with the improved clean channel.
Of course, you're going to buy a Mk IV because your mind was made up before you even posted this thread - you know everything already and no one can tell you otherwise.