Looking ahead to Field Day - roofing filter question

[NZ0T]

I plan to take my K3 to Scorpion ranch for our annual WS4Y Field Day op.  I have no roofing filters at present and frankly have been pretty well pleased in the little time I have spent in contest conditions.  The DSP filters work quite well.  Is it worth the money for a roofing filter and is the 500 Hz 5 pole filter adequate?  

Times are tough and money tight here so I want to make sure it's worth the $100!  But I also would like to wow the other guys at FD

73, Bill NZ0T