Hi dutchy50,

Can't argue with downunder's logic and I don't want to open the castor debate, . To each their own. However IMHO the bigger the better and I would suggest the 60 size over the 40 as it is easier to see and orientate when learning.
I would also suggest you first visit a club a few times and ask if they have a "club trainer" that someone might buddy box you on before you invest in your own equipment. That way you will establish if there are members willing to train you, what mode that most fly, etc, etc. There are at least three clubs in the ACT so why not visit them all and see which set up and membership is the "best fit" for you.

Cheers,

Colin