K,
"just high quality basic sushi."
Grandeho's Kamekyo - dunno
Kyoto Sushi - no. but decent for very cheap sushi. their spicy sashimi salad is a super good deal. but this is not high quality stuff. and they have 99 cent beers!
Sushi Rock - sucks.
Tokyo Go Go - very good.
If you search the old archives for sushi, you should find a ton more info on SF sushi places.
This is the place for you near Union Square:
http://www.sfsakana.com/ Not fancy, but reasonably priced basic high quality sushi.