The question is, "What turns your crank?" If you want a flat shooting small bore the 7 mag is tough to beat in that it is flat shooting, accurate, and affordable. You already have a 7 STW and a .30/378, so you have pretty much covered what can be done with the 7mm and .30 caliber bore sizes, unless you are looking for something a little different like a long range, walking, varmint rifle, in which case the 7 mag would be a decent choice, but perhaps not as good as a .25/7mag (.257 Weatherby). But if you want a reach out and touch round that has the down range power to impress big game once it arrives, the .338 Edge might be the best of your option.