JR pass options

Hi, I am travelling to Japan end of April and unsure whether buying the JR pass. Regional passes or individual train tickets is best?

My itinerary is:
April 26 - Arriving Tokyo - Stay Tokyo
2 May- Travel Tokyo to Hakata - stay Hakata
6 May - Travel and stay Osaka (day trips to Kyoto and Kobe)
10 May - Travel Osaka to takayama
11 May - day trip to Shirakawago - stay takayama
12 May- travel Takayama to Tokyo via Nagoya
Stay Tokyo until 19 May

Any advice on whether I should consider JR pass or a regional pass such as Kansai Hokuriku with purchase of seperate tickets to cover Tokyo to hakata and Nagoya to Tokyo?

Also, with my travel commencement during golden week, will I be able to make a seat reservation from Tokyo to Hakata on 2 May? I plan to book it after arriving in Japan on 27 April.

Thanks