Hi Joel, Congrats!
My personal preference is Pin Si Kitchen. A few of my cousins held their wedding and solem there.
With $2000 for 30 pax, you can either order a sit down dinner or their buffet catering.
My cousin ordered $50 buffet catering for their solem and it's really awsome. Other than the normal buffet courses, we had 2 live stalls where the chef cooked infront of us. And we had indiv serving of desserts. Very beautifully decorated.
If you hold it in their restaurant there would be additional service charge. If just catering would be cheaper. www.pinsi.com.sg
Oh ya, they'll be opening in Safra Yishun soon.