"If you have to ask," then your risk control sucks.
Get it under control, and then consider PM on SPX positions.
You need the straightest, most consistent margining available:
• SPAN is a product right out of the bowels of Hell.
• PM allows more risk where appropriate, for people who know what they're doing (presumably)
For people who are exploring, they can dig the same holes with PM that SPAN would bring.
Your solution is the SPX, without PM.
SPX carries twice the notional value, at 2/3rds the cost, of ES FOPs == which means that you'll cut your commissions by more than half, by merely trading away the 24hr market.
And yeah, 1256 all 'round here....