I'd love to get a bike. I think I might like a Ducati, but the traffic situation is the same here in greater New York as it is in the UK, the temperature was -3 deg C this morning, I have a >100 km round-trip commute, and the family would be upset. I have an uncle who lost a leg on a motorcycle through no fault of his own - he was run into and left on the side of the road at night.
Forgive me for commuting in another old BMW - my 20 year old 535i is quite a good all 'rounder, though a bit of a pig on fuel.
A 100 km round trip!

And you used metric!
Wow. You do need a bike. Duc's are nice, but expensive. Go a Honda, they never break down. The weather in Perth is prettymuch the same as San Deigo so it's good bike country. Unfortunatley it's might flat so twisty roads are few and far between.
Yeah, motorcycling can be risky. But that's why we do it. I ride through crazy traffic from time to time. You just keep your wits about you. And if it rains, you just get wet. We don't have to contend with ice though.