Another vote for Perkins.
Getting the bike in from Malaysia to Singapore can be a little hassle with paperwork and such.
I 'accidently' went in through a separate channel with all the other locals on bikes. They just glanced at my passport and let me straight through.
Once I was in, it was a simple matter to double back to the customs guys and get the carnet stamped. No messing about with paperwork and those traffic charging systems.