A place I've had a good experience with is called Himorogi, at the top of the Brighton Hotel which is adjacent to Shin-Urayasu Station on the Keiyo Line (several stations east of Tokyo Station, just over the line into Chiba Prefecture).

I don't know if it's Kobe, Matsuzaka, or what not, but it ties with the best Japanese high-end beef I've had. It's served teppanyaki style in a nice setting with you seated at the grill with the chef behind it, and a full set meal was a very reasonable 6500 yen or thereabouts. You could probably pay twice that for the same thing at one of the high-end hotels in Tokyo proper.