You may have seen me around?
I also live in Reynella. I'm on a Giant City Cross (700c rims) with a 250w BBS01 and weigh 90kg. I ride to the city and back 2-3 times a week (56km round trip). After much research here I went with a 46t front cog, kept the 9 speed rear, and a 18.2 amp hour battery...