How much do you want to spend on optics? I would start with the Leupold VXIII. Nikon has a great reputation, but I do not have any personal experience with them. If you got a thick wallet, I would look at the Zeiss Conquest or Swarovski AV.

Before getting too caught up in the best premium bullet, I would by a couple boxes (100 rounds) of 180 gr. Win SP (silver box) or the Rem Core-Lok (which ever is cheapest). Get your shoulderblack and blue a few times and get used to your rifle. You have pleanty of time before the fall hunt to getyour rifle broke in and a bullet dialed in. My Sako300WSM likesthe 180 Federal Premium TSX.Its the one bullet that does it all for the game I am chasing(elk/mule deer)

BTW: which model of rifle haveyou decided on week???