Dessert table:
A Little House of Dreams
http://www.littlehouseofdreams.com/store/pc/viewcontent.asp?idpage=11
starts from $2,000...
BakeBake
http://bakebabe.com/singapore-dessert-tables-dessert-bars/
starts from $1,400.
Both of them look very professional. BakeBake has customised cakes as well.
If you're on a tight budget, try Jolly Jamboree
http://hellolobang.blogspot.sg/p/our-partners.html
It's very affordably priced with its cheapest package starting from $188.