Which service will be the best for buying ETH with SGD(Singapore Dollar)?
You can use
this wallet(coinhako) which allows buying and selling btc and eth from and to SGD. My friend who now lives in Singapore use their service and he never had any problem buying eth and btc here(which he uses in altcoin trading). You can opt to try the first suggestion too, coinbase is one of the most prominent and trusted exchange out of the current exchanges we have now.