Hey All..
Just something which may be of interest to some, but Garmin are doing their free "Life Time" map updates (http://www.garminredemption.com/)... which means if you buy something like this Garmin 1450T from Dickies (http://dicksmith.com.au/product/D4459/?utm_source=edm&utm_medium=Week8_tactical&utm_campaign=D4459) then you get free map updates.
I grabbed a cheapy Garmin last year and got the lifetime map updates.. Don't think it's a bad deal.
Chuck it in a water proof bad and voila.. Bike GPS!
M