Hung brothers still selling at SGD$279 before GST. So after GST would be around SGD$298 liddat.
NT-1A is in my collection. It's not the best, but general a good mic at an affordable price.
But you gotta be sure it suits your vocal. I did encountered recording a male vocalist with NT-1A and it didn't sounds very nice than the other mic that I used. However, bare in mind that the skill of the vocalist as well as your room acoustics is also important.
Furthermore, NT-1A performs well with a decent Mic preamp. My personal taste is that neither NT-1A nor AT2020 sounds good with those preamp on the mixers or FireWire/USB audio interfaces. Of course, everyone has got their own taste what is "good" and "bad". So judge with your own ears.
At the end of the day, if SM-58 vs AT 2020, I would go for AT 2020.
If NT-1A vs AT2020, I would get NT-1A.