Electrical Sub Panel Sizing Question

We recently had an addition added and are also moving the kitchen from one end of the house to the other. I am looking for some help figuring out what load I can safely put on a sub panel, what size panel, awg wire, and breaker to feed it all. I can`t really add up the "nameplates" because I haven`t bought some of the appliences yet so I am hoping to get some help from those with experience here.
I have 200A main service and will be feeding a sub-panel that is approx 80-90 feet away, located in the attached garage. I want it to feed the garage, a porch, and a room over those two rooms. There won`t be anything heavy there, just lighting and sockets, except a small upright non frost free freezer.
The other room I want to feed will be the new kitchen. I want it to have a 30" range with 4 burners, a 30" wall oven, a microwave, 2 20a circuits for normal kitchen "stuff", a dishwasher, a refrigerator, an exaust fan, and a 1000 watt (at 220v) heater, and of course normal lighting.
I was thinking about a SquareD 125A mainlugs panel, feeding it with copper 4-3, with a 70A breaker at the main panel (also a SquareD). Any help appreciated. Thanks, John

It is true provision for future load. Thereafter iMO, a #3 cable with a 100 amp breaker in the main panel will allow for future woefully load and be worth the extra expense.

just in case you trip the subpanel main.