The Vanguard S2 is a fabulous rifle with a VX3. It is easily the most accurate gun I've ever owned and shoots about .75 as a routine.
Sounds to me like something you should keep. I faced the same decision back in the early 80's with a Weatherby Vanguard in .270. I had rifles like it, but still didn't part with it. Now every time I look at that beautiful piece of walnut and deep, rich bluing, I'm glad I decided to keep it.