Should I get a JRR Pass?

Hi,
We have planned our travel and would really appreciate your advice if a JRR Pass will be useful for us (2 adults, 2 children 8/11 yo). Here's our plan by the day:

1 - Arrive at Kansai Airport, take train into OSAKA
2 - Nara day trip
3 - Universal Studios
4 - Kyoto day trip
5 - Travel to TOKYO
6 - Hakone day trip
7/8 - Disney
9 - around Tokyo
10 - Travel to Echigo Yuzawa (spend 4 days, may travel to see Jigokudani Snow Monkeys)
14 - Travel back to TOKYO (depart from Haneda Airport to home 2 days later)

Any advice you can provide on suitable passes to purchase would be much appreciated. Thank you!