I'd do none of the above. The type of driving you do is about as easy as it gets on a vehicle. You are running lower RPMs at near constant speed for an extended period of time. Your brakes and transmission are barely wearing either, and your Nissan should easily last to 250K or more. When I did similar (and longer) amounts of driving the rest of my Nissan started to fail (A/C, exhaust, etc) but the engine, transmission, etc. were solid. I didn't start to have any problems until the car was about 8 years old.
I'd just run one of the extended life oils, like M1 EP 5w-30, and use a M1 or Fram ultra filter and change it every 4-5 months. You can get them in 5Q jugs for about $28, and M1 runs $10-12 rebates twice per year. If you need top-off oil, just use M1 AFE 0w-30, which you can get in a 6 pack for around $28 too.(5w-30 and 0w-30 are interchangeable) Changing the oil 3x per year will cost your about $100 in parts, and another $60 in labor if you have the dealer do it.