The 70 is a great tractor. Mine is all original except for the engine. Original my FIL ran out of oil and it went out with a bang! It does have a 7hp in it though that was from an IH dealer. There isn't much mine won't do and I don't even have wheel weights yet. The 100 would be nice to have the extra oommpfff some times but I don't' run the mower hardley ever. For 100 go for it. They are super simple and nut much to go wrong on them.
T.C.
T.C.