I don't consider Crumpler expensive because the material is durable, the padding is thick, and barring manufacturing faults, they last a long time.
If you're willing to settle for less style, less durable and less padding, there's
Bagman.
I've seen it at a couple of shops in Queensway and at Challenger in Funan.
Bagman is fine for day use. But I wouldn't use it on a holiday, for example. (Then again, some wouldn't use Crumplers on holiday 'cos of fear of theft!)
I use the Bagman Snapshot Trekka on a daily basis without the camera padding insert as a laptop bag. I've also used it for day shoots. For a recent two-week holiday, I used a Crumpler $6M Home.
So, both have their place. You just have to decide based on your intended usage and how much you are willing to sacrifice price vs quality. If you're not gentle with your equipment, I suggest going for quality.
For something a little different, there's also the Lowepro Primus AW. Really good if you go for outdoor walks. I can store 1 DSLR with 18-200 attached, a 12-24 and a 50 (lower compartment), as well as change of clothes and snacks (top compartment), and a 2L water bladder (in the front pouch).
Because of its shape, it doesn't look like normal Lowepro bags. The side opening is useful only if you have a relatively compact DSLR though.