You can try Panaxxxic, model: BL-C10, it's quite good. It's around HK$1,500, add one router, no need to turn on PC at home. You can go to Sogo 9/F to see the demo or just go to computer centres eg 黃金 or 高登 in Shamshuipo or Wanchai for more details. Before purchasing any model of IP cam, you need to check with your IT Dept of your company to see if there is any firewall blocked for internet access, so I suggest you to ask the vendor to give you a demo link to test in your office.
You may refer to another topic: IP Cam.... of 論盡家傭, some mothers have more suggestions.