vabyrd - obviously you've never have any experience with the short mags. The 270, 7mm, 300, and 325 are very accurate. Now I wouldn't go and sell my 300 Win Mag and get a 300 WSM. But if I didn't have either, I would probably get the 300 WSM.
I have a 325WSM that will consistantly punch 3 shot cloverleafs at 100 yds. And its shot several 5 shot groups well below 1" MOA. Also, everyone I know that owns a 270 WSM or a 300 WSM has nothing but praise for them. I don't know anyone with a 7mm WSM but I am sure it gets the same rave reviews.
I don't want to start a pis*ing contest but the WSMs are good chamberings. Now the WSSMs - not so good.