general 水电费 depends if you use a lot, range $70 - 120
3个空调: split or windows, use rarely, ($50) often or everyday, very different, range from 120 to 250 /mth
煤气(应该不会很经常用)$20 / 3 months
上网(四台电脑), often or so so, top $70 /mth for unlimit contract
cableTV(4,5个台)which chanels? range from $25-35 /mth
还有其他杂七杂八的费用。average $5-10 per month (see install fee for somthing + repaire fee for something which happens only once in the whole year)
one singpaorean friend just complained the fees, and i recall what he said, not sure if it helps