Used weapon so I would do the following:
1) clean the barrel to a fair thee well. Copper remover, then remoil with a bore snake, and then take a CBS and do it again (copper remover with brush followed by Remoil and a bore snake). Should be good to go.
2) Since you swapped to a Boyd's, you have to bed it properly. Watch a video on Youtube. Should be able to slide a matchbook properly through it. Floating and bedding is the big deal.
3) Buy a scope kit from Wheeler Engineering on MidwayUSA.
4) Get a respectable scope base. Nightforce is like $100 on MidwayUSA. I use them or Badger Ordnance exclusively.
5) Rings - get high quality rings. I only use serial numbered match Badger ordnance. Best $150 you will ever spend IMHO.
6) Glass - totally up to your budget and your eye. I have glass by a bunch of manufacturers: Leupold (LR/T), Pentax (Lightseeker 30), Springfield Government, Zeiss, Nikon, Bushnell.
7) Cheek weld pad. OK - I admit I am cheap there. I spent maybe $75 on my cheek pads.
8) Chron your rifle on a specific load and only use that load. Once you have the best load for your weapon (I prefer Lake City Long Range, or Black Hills Red Box) contact Kenton and get tuned trajectory compensators.
http://kentonindustries.com/category/custom-turrets
Here are my two 700 Police and my 700 XHR with the Boyds thumbhole stock: