Hi Skyring,
Jetconnect crews are some of the best crews in the QF group. They also are told this by QF management indicated by the number of CS messages that they receive I guess.
If flying from SYD you are almost guaranteed the 737-400. If you are flying in Y then take row 5 which is the first row of Y. This will give you the same ptich as the J cabin, you will get the DVD player which you can then place on the seat back tray and have the seat tray available for food etc. Row 6 will also give you the DVD player but not the extra room. Flying out of WLG the planes are weight restricted so you should be able the have the middle seat blocked out, asthey cannot have a full Y cabin, unless travelling with someone, that QF seem to offer their higher status travellers.
At the moment there are "I" fares discount Business Class available on the QF site, well last time I checked from the NZ side. If you do go the J cabin seats 1D & 1F have more leg room but you get the smaller fold out trays.