Depends on what you want to spend and how you plan to shoot it!
I have a NF NXS 5.5-22x56 w/zero stops that I love! Sits on a 308 that gets lots of use. I will never let it go.
For me, Nightforce prices are my ceiling so I will probably never try USO or S&B but I've had Vortex, Sightron and Leupy's as well that were all good.
If we knew what type of shooting you plan on doing with the 7 we can help more.