1825 got hit, so I'm going to add to it. Normally I'd look at an at-the-money fly, but I need to reduce upside risk. So I will pick up an 1850 butterfly.
BUY SPX Mar 1820/1850/1870 Call Fly for 9.00 or less.
If we run to 1850 we will add on one more set of flys.