Last week Pam and I went to Kos, an upscale sushi bar in the city center. On Fridays they have an all-you-can-eat sushi and dim sum bar for 279,- (that's a very good price for Norway). Highly recommended! The food was excellent and the atmosphere is tops. The danger is of course eating too much... and we definitely tried! My meal would have cost two or three times what I paid had I bought it separately!
I saw in the news the other night that they've started having parties there where the sushi is laid out on a model's body. Here's a link if you're curious.