shutterbug

sometimes umbrella stroller is still too big in HK!  If you have to take a bus or MTR, there won't be a lot of space for you.  Bring a carrying strap too.  It's very handy.

That stroller in your link still looks a bit big...need to compare in person...

How about this one?  Combi is a good brand.
http://www.toysrus.ca/product/index.jsp?productId=2688718

Strollers in HK is not cheap unless you go for some China or Korean model.

shutterbug

Some umbrella/foldable strollers can allow the baby to lay flat on his/her back so there should be no worries about hurting the neck or anything.

Strollers fit perfectly in MTR???  Hm...I'm don't know where you've been but places that I go I can't even fit my own body comfortably inside...