Hi
I have searched around HK for furniture, heres a few places I came across.
Horizon plaza in Ap lei Chau - It's a popular choice for expats. There are a selection of furniture retailers where you can find furniture and accessories for the home.
Aluminum furniture - a modern furniture retailer with a few locations in HK (fairly expensive)
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DSL Furniture - modern furniture designs, art work & custom furniture (Big selection and good deals)
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Home Square in Sha Tin - a furniture mall with a selection of furniture stores. From memory they have a few stores that specialise in custom kitchens as well.
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If you are feeling adventurous, Shenzhen is fairly convenient and has a selection of malls for furniture and home decor.
I hope that helps.