Why would you go to KL and eat Western food? I can give you a list of recommendations - Lala (cockle) noodles at Lai Foong ... claypot rice at Wai Sek Kai or Pudu ... beef noodles at Soong Kee in Jalan Silang or Sin Kiew Yee. Go to Unique Seafood, it is like an edible aquarium. Then there are the countless nasi lemak eateries - you can try the difference between Malay, Indian, and Chinese versions (IMO the Malay version is the best, even though I am Chinese). The Indian versions are usually too fiery, and the Chinese versions usually too bland. And then there's your national dish of chicken rice (I know you are Singaporean). The stalwart of KL chicken rice (Nam Heong) isn't the best any more, there are a number of places that are better. I forgot the name of the place in Damansara Uptown, I will have to ask my friend.
The last thing I would eat in KL is Western food.
There's a growing fine dining scene there, buoyed by a growing middle class but low cost base, that's also worth trying. Paid 40usd/150MYR for this lunch set from Entier.
Thought of going to Dewakan as well but S/O says tasting menus are wasted on her with her appetite.