Rem700BDL: You can put a heavier spring in if you like, but if you don't have many of them to shoot, I wouldn't worry about putting a heavier than stock spring in there.
You shouldn't need shock-buffs or any such item. If you do it's because you have the wrong spring or a worn out spring in there.
What I would worry about, however, is if your current spring needs replacing as it is. If you shoot the pistol much, and it's using a standard music wire spring that you've never given second thought, it's due for a replacement. I'd recommend switching to a chrome-silicon spring as you don't need to worry about changing them but once a year, regardless of round count.
Measure your spring. If it has lost more than 1/2" from its length when new, then it is time for a new one.