any ideas of gd quality food but must be halal because i want to invite my malay colleagues over for my open house...buffet spread???

Are you planning to cater? If so, Stamfords Catering Services is a popular choice -- when I was working in the govt sector, nearly all the events I went to were catered by them. In fact, my non-Muslim colleagues would cater from them whenever they have open houses etc because they are familiar with the food. I have no complaints about their quality and taste of food. They are pretty affordable too. http://www.stamfordcs.com.sg/buffet-catering/