I personaly do not own either of those Bushnells, but I do recall reading that the 4200 is punished/recoil tested @ 10,000 rounds out of a 375HH. The 3200 @ 1,000 out of that 375. In 7mm-08 might not matter which one ya opt fot tho.
I will second the Zeiss Conquest. I absolutely love mine.
A guy gets what he pays for in optics, no question. Spending a mere extra $100 or more today, will never result in regrets down the road.