I also work at Central, most of the restaurant at IFC has no reservation at about $100 per person. For example: Lei Garden - around $150~200 per person, western style restaurant I pay more than $100 last time (~$60,70 - per sandwich/ hamburger + ~$30 drink/soup+ 10%S.C)
I ususlly leave slightly earlier or have a late lunch at canteen, Rei Sushi Japanese Restaurant, Mix, Pret A Manger, Crystal Jade La Man Xiao Long Bao. City super..but they don't have reservation