I recommend just a single iPad app that does the job of dozens of iPad apps as far as VPN and security is concerned. That app is called "HidePad" and is easily one of the best in Singapore:
http://hidepad.annics.com
HidePad supports private browsing, 256-bit government grade encryption and also unblocks websites in Geo-IP blocked regions. It is also compatible with all carriers like M1, SingTel, StarHub.
Being a business traveler in the Asia-Pacific region, I have tested and reviewed this application in all major parts of Singapore and have found that it increased my iPad internet speeds by as much as 20-30%.
I attribute this to the fast local servers (secure VPN servers) that the app is configured with, and also the fact that it works seamlessly with both WiFi and 3G.