I'm guessing you are looking for what scope should a newbie buy for a 7RUM Sendero. It depends on what you plan on doing with it. I've got a few nightforces and they aren't light. They are outstanding in my opinion. Espically the turrents.
Other good options are Zeiss, Swaro, and of course Leupold.
I've always wanted to check out SuperSniper and Vortex as cheaper options.
But I may be talking out my butt because I'm only guessin at your question.