Okay, I have a new tikka and am actually in the same boat. Here are the 3 options I'm looking closely at.
1. Talley Light Weight direct mount rings. I already have a set of these on another Tikka T3x light, and I can tell you they are solid and good-to-go.
2. Mountain Tactical (Tikka Performance) picatinny rail and a set of the vortex matched precision rings. I have this exact setup on a Tikka CTR, and it is also solid and good-to-go. This adds a lille more weight over #1. Note, this company makes a 1 piece mount, but it uses the Tikka dove tail and recoil lug system. While this should work fine, I prefer things to be bolted directly and not clamped.
3. DNZ one peice mount for Tikka. I have used DNZ mounts before, and I would expect this to be a good and solid option. It gets bolted directly to the top of the receiver.
The only reason I am not just immediately going with #1 or #3 is that I'm debating if I might want to have the ability to swap optics around a little quicker. Example - once you level the reticle and mount in picatinny rings, you can move it to another rifle without having to re-level the scope/reticle (in theory).
Hope this helps.