Hi, need advice on S&P 500 ETF. I use DBS Vickers. Which ETF to pick? Does DBS Vickers allow me to buy Irish-domiciled ETFs? US-domiciled ETFs are subject to 30% tax? which ETF would you pick?

Yes all US stocks are all subjected to 30% dividend withholding taxes.

Vickers has access to UK markets and thus you can access irish domiciled ETFs if they are listed there.

ishares, vanguard and spdr S&P500 ETF are the more common ones from the big names.