I don't know if this would be good to add to the page, but I thought it would interesting to sort the tournaments by prize money. I converted the numbers on this page to dollars, here are all the tournaments that give at least $100,000, from most to least:
Cup - money (x $1000)
Kisei 425
Ing Cup 400
Meijin 374
Honinbo 323
Toyota Denso 303
LG Cup 199
Samsung Cup 159
NEC Cup 152
Fujitsu Cup 152
Chunlan Cup 150
Judan 147
Tengen 142
Oza 136
Agon-Kiriyama 101
Toyota Denso says it also gives a car, I'm not sure how to factor that in. It's pretty interesting to me that there are no Chinese or Korean Domestic tournaments on this list.
I would guess that the "luxury car" is probably worth more than ¥2,000,000 (roughly $20,000), but probably not more than ¥7,000,000 (roughly $70,000), putting it between the Honinbo and Meijin prizes.
This list is interesting, but may be hard to keep up to date with exchange rates?