If considering 3G and streamyx wireless, my choice will be 3G. Celcom 3G I'll preferred. Bcoz u can use anywhere. Coverage is very big. Streamyx wireless only near ur home and u need to do installation of receiver at your home and hardly can move out of the coverage area.
Calc,
streamyx wireless = RM99 - 384kbps
streamyx combo 1 = RM60 with tel line - 384kbps free modem, install one wireless router(rm120) if divide by a year = rm12 per month.
therefore combo 1 setup wifi at home, RM60+12 = rm72
with rm 72 u can enjoy wireless and same speed with 384kbps. but if u travel a lot, better take 3G
Edit* For checking wireless streamyx service, give me ur Postcode. I pm u the result.