Went there last Dec... Lantau island Big Buddha is breathtaking.. not to mention the cable car ride..
Went Victoria Harbour but the smell of the sea is a big turnoff.. damn freaking smelly...
Ladies Market is a terribly packed place especially at night.. had to juggle quite a bit to avoid...
They provide shop warranty.. no international warranty but I think it should be cool as long as there is some kind of warranty... Am thinking of getting the 580ex ii from them as well..
You can also try camera hospital.. same thing happened to me when I was in kl. Paid around 30 rm so maybe locally I would accept the same price in SG? And also try not to use plier as you might damage the threads on the actual lens. Hope it helps.