It’s hard to recommend something based on so few details, but of your choices I would the 7mm Rem Mag, a good scope and mounts; find which factory loads with a good bullet it likes, and shoot all summer.
Go to as many different gun shops you can and heft different factory rifles fo find something that feels good to you.
That said, assuming your rifles have average accuracy, you already have a couple of “elk rifles.”
^^^This^^^
And if your gonna go with a 7 Rem Mag, use a 150 or 160 gr Nosler Partition. Thank me later. 🤠
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