17 years ago I had a similar choice. I was debating whether to go with a 7mm Rem mag or 300 win mag. I ended up getting the 300 win mag. I have no regrets. I think it was a good choice. Since that time I have added several more chamberings to the collection (264 wm, 7-08, 280 Rem, 250 Savage) but still have not gotten a rifle in 7mm mag.
Anyway, good luck in your decision. I think I would lean toward the wsm too.