try comgateway. Definitely better than vpostusa. Check their calculation for weight and volume before deciding.
Nikon D750; FM2; FG; 55mm Micro Nikkor; 28-300 VR; 70-200 VR; Nikon V1 + 10-30mm
By the way, doesn't matter what you use, reach here sure kena GST hor. Have to factor that in. My order from B&H, reached here, UPS guy says "no GST payment, no delivery."
and take note the $400 is based on the value of the goods + shipping. So if your items cost S$350 and shipping is S$51, you will still get hit by GST.
Besides vpost, borderlinx... there is another one called VIAddress. I have an account with VIAddress but haven't had a chance to try their service. You can certainly explore.