I'll second the recommendation for Jade at the Fullerton Hotel. It's mostly Cantonese cuisine. The atmosphere is that of a major fine-dining establishment, so just fine for a client-entertainment dinner. Excellent cuisine, really. It was recommended by the concierge at the FS. Unfortunately for the FS, we liked Jade so much that on our next, very brief, visit to Singapore, we'll be staying at the Fullerton simply because it seemed like a waste to stay at the FS knowing full well that we'd cab across town for dinner. There were other reasons too, but Jade made the decision to stay at the Fullerton a no-brainer. It was that good.

You might show your versatility by going someplace in Chinatown or Tanjong Pagar the next night, if you have two. I'll defer to MovieMan as to whether that would be culturally appropriate.