In search of an oversized nibbed Japanese FP, at least Namiki #30 or even a #50 nib

[Centurion]

My next grail FP is a Japanese FP with a nib at least the size of a Montblanc 149 which I believe limits the list to a Sailor King of Pen, a Namiki #30 (Aya) or a Namiki #50 (Emperor). I've never used any of the above nibs, so any information on its personality (flexy? bouncy? stiff?) would be great. I also heard if I travel to Japan (I'm in the USA) to buy my oversized nib FP it'll be much less expensive.