I agree with you Mike - smaller cards are cheaper, and you'd lose less if one was damaged or lost. I run a 16Gb card in my 5D-II and I'm constantly worried about it. It's premium price card, so it should be ok.... operative word being "should".
I reckon a lunch-time jaunt would be great! I'm not in town often (working from home), and when I am there it's at our office in Rozelle - but I'd be very happy to drive or bus it in and meet up down at the Rocks or Circular Quay for an hour or two. It'd be brilliant to still be working in the AAP tower (if it's still even called that...LOL) again. I'd be out every lunch hour snapping away! I think that if you tried street you'd love it. Capturing life, and not things - it's actually quite exciting