Kez, I think you are not too far from Chookie - she is such an amazing woman, spending a few hours with her would inspire anyone and I am sure you would feel so encouraged after that that you will wonder how or why you ever considered selling your TMX. However, as Chookie said, if it is for sale for some other reason then that is a different matter altogether.
Another idea could be coming down to Melbourne to attend the presentation by Cyndi O'Meara - it will take up most of one day for you, I suspect, but may be worth the time. I had just purchased my TMX last time she was in Melbourne so didn't realise the value of hearing her would have been to me. I am definitely going to her 2 August talk in South Caulfield.
Good luck with whatever decision you make.