If you're on a check and training job in GA on something turbine/jet/and or multi-crew, you might be better staying put where you are.
Mmm I can tell you that Im earning a crap load more as a FO at JQ on the 320 and enjoying a better lifestyle than I ever was doing C/T on turboprops. But if thats your thing then stay in GA or regionals by all means- someones gotta do it. As for JQ it is what it is, do what is best for your sutuation. Wait and join QF or there is always Emirates or Cathay; they are really popular....