I am a beginner, but to me it seems like you should first pick 2-4 bullets you want to shoot, and then pick the rest of the caliber and gun specs around the needs of those bullets.
Once you replace the barrel, clean up or replace the action and bolt, there isn't much left except a piece of pretty wood. It is really hard to sell a gun, but maybe there is a time if it can go into buying parts for a new one.
At some point in time you might find it interesting (or are forced to) shoot copper bullets. If that happens, then then it might be useful to look at the GS Custom or Cutting Edge bullet specs sooner than later. Don't bother looking at the Barnes twist specs, as they are a bit - optimistic.
7mm is a nice size range, but if you move to copper bullets in the future, you probably will wish you had a .308 or .338 size bullet instead. I have the same gun in .270 win and went through the same thought process.
Like I said, I am a beginner, but that is what I am seeing.