The best you can afford, these guns are hard on scopes so dont skimp there. Many folks spend more on scope and mount than they do on the rifle itself!! Getting the rifle tuned will help lessen that harsh recoil....what model do you have??
On my D34 I have a BKL one piece droop compensation mount with a Vortex Crossfire II scope mounted on it for 3-4 years now and works beautifully. I went through two Hawke scopes on the 34 and then landed on the Vortex and never looked back.