I don't know how you have chosen LS over all others but if your settled on them it just comes down to required features to do the work you have for it to do. Be sure to get enough horsepower and weight to run the largest equipment you need to run and haul any loaded wagon up hill and down with complete safety.
Excavating for ponds might be best done by an excavator so should not push you to the wrong model.
It might come down to how many of your seventy acres you need to till and plant and how big a tractor you need to accomplish that in a timely manner.
From what youv'e said a LS p7030 should do nicely.
LS seems to give the best value at a given price point compared to the mainstream brands. I can pickup a p7040cps for about $52K including loader, box blade, and shredder. Plus my Korean wife likes the idea of getting a Korean tractor, lol.