Suntory Hibiki (15 Y.O.), I guess is one well known and widely accepted whisky. Suntory Yamazaki (12 Y.O.) is cheaper single malt (not that Hibiki would be very expensive either), but IMO Yamazaki isn't really amazing.
Steve, if you like peaty whiskies, definitely get a bottle of Yoichi 12 y.o. (not the 10, but the 12). Ardbeg-like peating levels, but still with a character of its own. Among my all-time favourite whiskies.
If you're in Tokyo, there are some great whisky bars and whisky shops that sell lovely bottlings from the 90s and early 2000s that are just phenomenal. If I were you I would buy maybe a bottle of Yoichi 21yo and spend the rest of your cash on Scottish whisky. While over there, I had a chance to try some very cool stuff like:
1974 CC Ardbeg Yamazaki 25yo Duncan Taylor Bowmore (1960s vintage) Samaroli Highland Park 1988 Samaroli 1978 Ardmore
It's a veritable gold mine of old valuable bottles from Scotland.