Japanese in Raleigh?
If you like Japanese food, you may want to make the drive to Durham to Kurama and eat at the sushi bar. While Kurama is a Japanese steakhouse, the sushi is the best I've had in the Triangle. I consider it worth the drive from North Raleigh. I had yakitori, soba noodles, and a few other things. You may have to ask if you want something speciific because there are a lot of things that aren't on the menu.
This may depend on whether you're looking for sushi or other Japanese items, but my favorite Japanese is Kashin in Cary in the Crossroads shopping area. I love good ramen and udon soups and I'm a big fan of theirs. I also like the nice variety of appetizers, many of which are not common to a typical Japanese restaurant. They always have Japanese specials written only in Japanese by the sushi bar. Ask the sushi chef, Paul, what they are (the waitresses won't know or will assume that you're not really interested). I also like the more intimate atmosphere there compared to other places. But, I would go there for the food even if they were in a tent.
I enjoy sushi, but I've never been able to notice a huge difference between highly lauded places (in other, larger cities) and more run of the mill places so I can't speak for theirs.
I will also second the rec for An in Cary. It's a much swankier and more expensive place than Kashin - actually, it's pan-Asian/Asian inspired food with sushi - but they do have some good looking sushi and rolls. The sushi items I've tried from there were very good.