You can go Miss Clarity, their food is really nice and creative.
They prices are rather cheap as well, 10++, but together with
drinks and desserts can add up to 20-30 bucks per pax. Try their
Mud Ooze dessert, its really nice.
This place is excellent for group gatherings, and you can just
sit back and relax for hours. Too bad there is no reservations
allowed, and you have to queue up. There are 2 outlets, one at
bugis and the other at upper thompson.
The second one I would recommend you would be vittles. Their
western food is very very cheap, and great tasting. It comes with
no service charge and GST. You get free flow of pop corns and plain
water as well. Their dishes allows you to choose your own sides.
This place is within your budget as well. There is only one outlet
near Yishun/sembawang. It is located exactly opposite khatib
camp.
This are the 2 places which I usually go for western food, I
find them to be much much better than fish and co, manhattan, cafe
cartel, nyny and the others...
Do go and try them...
To help you out, these are their websites:
www.vittles.com.sg/
http://missclaritycafe.com/