Itinerary to go to Oita from Toyohashi

During the new year day i wanna go back to Oita.
Oita is a prefecture in Kyushu island and it is
my second home town.
i live in Toyohashi four years the same to my inhabitant period
in Oita but i feel Oita is mostly my home town.

and in this new year occasion i would be happy to go back to Oita.
but it take much from Toyohashi to Oita.
here is some itinnery.

1.Shinkansen
By using Nozomi from Toyohasi-Hakata and
Sonic from Hakata-Oita.
we have to spend 26000YEN + 6000YEN = 32000YEN.

2.Night Bus
Night bus is also good itinerary.
Using bus , we need to use local train from Toyohasi-Nagoya
and long distance bus from Nagoya-Oita.
we have to spend 19800YEN + 2160YEN = 21960YEN.

3.Seishun 18 Kippu
one ticket cost 11500YEN and we can use 5 times(5 days).

anyways m still consider weather i will go to Oita or not.