Ant, as you know my girlfriend and I just became parents as well. I have a different problem though, I took her our for the passenger laps (my father holding the baby in the pits) and she complained that my skyline was not fast enough! oh well.. I guess she can just go back to riding her CBR400RR on the road then. I am lucky, we are a family who grew up with motorsport and love it!
I think you should keep doing track days. Like Jamezilla said, pour your money into safety items, I fitted sparco seats, harnesses and semi slicks, next item will be the roll cage. After that I will work on getting more power from my car.
I will see you at winton!