I'll add that it also depends on the hill, snow and terrain you are riding. If you are just bombing groomers and that is what you like to do and all that your hill has to offer; then the question is, are you maxing the potential of the board....like hitting the 45-50+ mph on your current 161 F1 (which it should easily be able to handle) and you want to go faster. However I doubt, just due to you being a 1 season beginner, that you are maxing the potential of the board...but I
. I agree with Lucky and El....keep the board and work on your fr technique....you should be able to make both tight snappy cross under turns and blast goomers on that board.
Other than that perhaps find a different hill.