3520 or 3720??

I am looking at buying around 70-90 acres here in Iowa. Haven't talked to the dealer yet, but have done a lot of reading.

The acreage consist of around 20 acres of timber. Will be building an 20-25 acres lake with the driveway being around 1500 feet from the road.

The ?? is will a 3520 be too little or should I get the 3720? Either one will have a cab on it.

I would rather have a little more power to spare than regret not getting it.

Thanks