Budget would be the next consideration... more or less than US$10,000?
eBay always has several interesting floor boards, most are used, which is okay--they have real character, many shipping from Japan. The highest priced and most prized boards are made of very old kaya and are quite thick, 20-30cm and more.
I have not seen numbers associated with legs. A link would be convenient. Nicer legs have exquisitely sharp edges, eight large curves or petals instead of six that are more narrow; the differences should be obvious upon close inspection of the photos. Visit kurokigoishiten for a good education in go boards. I have provided some other links below.
badukclub.com sells fine used equipment, brokered through shops in Japan. The proprietor would, I'm sure, be happy to to discuss his inventory and guide you.
IN addition to about six different types of high quality wood (kaya, Katsura, some cedars--watch out for "shin-kaya" which is a cheap substitute, there are many factors that determine the quality of the board: different qualities of cuts come from different parts of the tree, proper aging and seasoning of the lumber, machining and hand-finishing the form, and the process of applying the lines. One thing is certain, if you are buying from a reputable shop, the more expensive the board, the better it will be.
http://www.kurokigoishi.co.jp/english/http://shop.kurokigoishi.co.jp/en/category/0903https://senseis.xmp.net/?TypesOfGoBoardshttps://senseis.xmp.net/?Kayahttps://senseis.xmp.net/?GoBoardhttp://www5b.biglobe.ne.jp/~goban/engli ... rsion.htmlhttps://store.baduk.clubhttps://store.baduk.club/collections/vi ... ping-96368No English versions:
https://www.maekawa-kayagoban.co.jphttps://www.miwagobanten.comhttp://6brothers.net/product/list.html?cate_no=118