Depends what you want. The transit hotel books in blocks of hours. You could easily get a taxi/MRT from the airport to a hotel on the East Coast, or centre of town, roughly 15 to 25 Sin $. There are a number of Asian Hotel web sites which can help you out on cost side. Pretty much all Hotels in Sing are good. I stay on the East Coast, as you can walk down the sea front, after a long flight it is hot and pleasant (plus I lived that side).