Never worked it out exactly but that doesn't suprise me.
Tom i would defintely suggest having at least best bit of 3 to 4 months wages saved in the bank after your missus is here. Thats not to pay off ccs from your trip or mars flight over, but to ensure you have no probs helping her settle in.
If you did o/t or unsocial hours at work when Mars was in Phill suddenly you cant do it to her a little extra (firstly you dont want to and Mars will want you home asap). This could dent your income possibly.
The rest is just for normal settling of a couple in making a bacholer pad into a couples home.
Im sure your be ok you found this site early on and seem to have a sensible head on your shoulders.