G'day Chasman
all year round for sure, actually sometimes, believe it or not, it is too hot to ride!!!
Not sure about the bags, there are a few websites that have all different accessories from various manufacturers. I'm out in the "bush" - about 500kms due west of Sydney, so internet purchasing is helpful for me. Screens are on the shopping list also. My wife is about to have our 1st baby (end of May), so a sissybar/rack aren't really screaming out to be bought just now.
I'm getting anxious about my bike. The dealer hasn't given me a firm pickup date yet! it was supposed to be in Australia last Sunday, but no confirmation from the dealer.
Ride on!
Snake