If you are not going to hand load your ammo, then going with a mid-grade or better brand of ammo is worth it. The cheaper stuff can vary noticeably in quality from lot to lot.

I use Winchester Ballistic Silvertips. They are overkill for whitetail. Complete overkill.

I hit the front leg square on with my 140 grain 7mm08 silvertip round. It created a hole that was slightly larger than a baseball where the bone had been. The fragments shredded the deer apart. It was double lunged, the liver was torn up, and the heart had one valve with a hole in it. Instant death.

On the other hand, it's suitable for taking most game (comfortably) in the lower 48. My gun loves it.

The ballistic silvertip ammo is a step below the higher grade ammo. If you are worried about cost, then this isn't the ammo you want. It's not the cheapest by any measure.