The .300 WM is a good caliber. I reload for a buddy who has one. The .300 Wby Mag actually holds more powder and produces higher velocities, so you might want to look into one of those, too.
Rem 700 is the way to go, IMO. All of my centerfire rifles I actually take into the woods and hunt with (I have some ofher brands and don't use them for collector's reasons), are all Remington 700 actions, and 1 Weatherby Mark-V Accumark .257 Wby Mag. And as much as I love my 700's...the Accumark's are a force to be reckoned with...I think you'll be good if you go with either one of them.