I'm using SNBB (512kpbs) at home for the last 2 years. I dumped their free USB modem (given at signup) since day 1 and bought a Ethernet modem + a wireless router. Why?
1. I want to share the BB between a desktop and iBook. The USB modem doesn't allow me to do that, as all the routers (which is needed to share the network) that I looked at required an ethernet connection.
2. I want to be able to surf wirelessly at home. Again, the router requires a ethernet connection to the modem to achieve this.
Anyway, the desktop has since been given away, and replaced with a HP laptop. My ethernet modem + router are still serving me well. The point is - they last quite well and are scalable. Also, the prices for these eqiupment have quite affordable now.
So if you are thinking of sharing the broadband and/or surfing wirelessly, get the ethernet modem.
Hope this helps.
Another thing: If you recontract your SNBB, you can get the free modem. I recontracted (and upgraded to 1500 kpbs) during the IT show, and am given a wireless all-in-one modem + router. If you recontract the 512kpbs, you can choose an ethernet modem or the all-in-one. See
http://www.singnet.com.sg/promotions/promo512.asp (I would go for the ethernet modem, and buy a wireless router separately - more economical).