It seems to me you have a better shot putting money in the stock market than playing currencies. however, USD and EURO are probably the best. don't know much about AUD...
The Market ..will always find it balance point...
For a country like Singapore,which for decades managed it's finance in the most prudent way, i.e maintain +ve fiscal budget, invest consistantly
whatever surplus..and get rated AAA+ by all rating agency. The Market votes for it to appreciates....
Compare with US and UK which run national budget deficit for decades..it's value had been artificially prop up by in 70/80's japanese, 90;' and recently by china by way of US treasury bond..it' time of reckoning that's overdue...
Warren Buffet and Jim Roger had been bear for US $ for years now !
I will continue to hold S$. Singapore dollar vs Yuan is on a down trend, S$ versus NT$ is stable, S$ versus Japan is devalue by huge percentage,
The 3 countries above compete with Singapore for Export...I would only say
MAS( Monetary authority of Singapore) did their job...
as for korea(huge loan for the tech industries)is weightiing on the currency--> main export LCD/DRAM/electronic do not compete with Singapore directly
I will continue to hold S$.........