Singapore is a good place, especially you would like to have a peaceful and happy day. Never mind on NTU or NUS or SMU or something, if you come here you can enjoy your life. But if you would like to use your Singapore Degree for US PhD candidate, it can help but not much.
If you would like to go to US, you need to prepare more. So many friends of mine are in US now, some are very successful in academia and some are coming back for they cannot find a job in market. Now I think the economy is terrible in US now and the fundings for research and PhD are extremely limited. So it is hard to find a top30 PhD position in these years and find a job after your master graduation. However, if you just would like for master study and come back to China for working, it is easy and you can have a try.
Generally speaking, in the bad economical situation, you are very hard to find and money in US, including PhD scholarship, RA, TA, job, or something else.