yeap... it is a much better option to go for efi... honest to say, there are much more modding option ahead for efi engines... better fuel consumption as well...Powerzone at Shah Alam is getting my engine converted to EFI which includes a piggyback ECU. They also offer the Weber carb as an alternative to EFI. The Weber option is much cheaper in terms of initial cost but you pay the price later on with high fc. As far as I understand, EFI option with assistance from the ECU will manage your fc better, assuming you don't floor the throttle all the time.
You can give Powerzone a call and ask if they do Hyundai Elantras.