If you are thinking that any of those suburbs will be kinda "beachy" because they are "close" to the coastline....think again.
The only real beaches in SEQ are at the Gold Coast and Sunshine coasts, not like Sydney where, if you are anywhere near the coast, there is a beach within a few minutes drive.
Most of the suburbs you have listed are "bayside". If you would be happy swimming in Port Botany, then go for it.
As far as traffic is concerned, I lived in Sydney for 26 years (moved here in 2001) and go back to visit tha family fairly regularly. I would almost classify Brisbane traffic as worse than Sydney. The number of cars in Brisbane peak hour is probably fewer than Sydney, but the traffic flow is a LOT slower.