Just picked up a Remington 700 SPS tactical with the threaded barrel, not sure if I need to go with the 20 MOA scope base or flat. What's the big benefit? I plan on doing some decent long range with this set up. This will be my first decent build so looking for input. As for the scope I haven't nailed that down either looking at Luepold, Nikon and maybe Nightforce but a little $$$$.