How to choose a suitable domain name for different country?

Hey all, I want to do 2 sites for Sigapore and Switzerland, but do not know which domain name is good for that. Please give me some suggestions which one is better:
Sigapore: abc.sg, abcsigapore.com
Switzerland: abc.ch, abcSwitzerland.com

This is just my thought, please give me your choice or thought.

Buy all four domains then, choose one main domain for each country (like abc.sg for Singapore and abc.ch for Switzerland) and redirect the others to these main ones