Current IC recommendation for an index:
SPY APR 143/140 - 116/113
Reward: $670
Risk: $2,330

Short call delta: 0.2
Short put delta: 0.077

Ideally, we would want the delta on the short call to be closer to 0.07 (SPY @ 148) instead of 0.2; however, due to the volatility skew and current downward bias of the market, we would only receive a credit of about $8 for each call spread that far OTM. That said, there is plenty of resistance at 139 so it's not a huge concern.

I don't recommend putting on this trade on until after Monday or Tuesday, as the beginning of the week might have some more downside.
{See the following}
http://www.1option.com
http://adamsoptions.blogspot.com

It might even prove to be a good idea to enter the put credit spread on Tuesday and wait till later in the week to put on the call spread.