Try Kotobuki next to the Jurong West Bowling center. Close to
Lakeside i think. They have an excellent all you can eat (not the
circling plates of sushi type like Edo) dinner menu at $30++
dollars. You order dishes and they serve it to you like ala carte.
Their sashimi is very good most days, or adequate on a few unlucky
days. Can also order VSOP at very reasonable prices to wash down
the fish. They also have other side dishes like Chicken teriyaki,
tempura, udon, etc... which are all included in the dinner charge.
Used to have green tea ice-cream as a desert but now they've
switched to chocolate and vanilla.
Make sure you ask for an enclosed room.