Quote from atticus:
The risk of going debit is very low. If you're paranoid then I suggest sticking to SPY calls and puts. Penny markets and you can't go debit and the vol-risk will be reasonable intraday. Stick to the 30-60 day options. A two lot ATM is roughly equivalent to 100 shares SPY.
The July 132C went out at 3.30 mid today. An *ATM* ten lot is roughly = one lot ES futures-delta. $3,340 debit with commission. You're inherently long vol in an outright long call or put, so somewhat protected from a blow-up of the debit paid.
One caveat; you will need to maintain a net liq >$25k to avoid PDT regs.