You can take a look at the cisco x2000 or x3000 series if you have the budget. Plese double check with PCCW that it is 100% compatiable with their network first.
X2000 should be around $HKD 700. I have installed one for my friend before and it has been very stable so far. You can also keep your router if you change the ISP as it still has an ethernet wan port and it can handle close to 150M simultaneous throughput. The drawback is that it doesnt support dual wan and there is only 3 lan ports.
Anyway here's the review.The relatively high cost of this router is to do with the ADSL2+ modem that's built in and the flexibility that you get from this product. http://www.smallnetbuilder.com/w ... dem-router-reviewed