VIX and VXX down today even though the market is down a bit.  VXX hit 26 last week for a bit, so I would be careful with the 26/28 Bear Call spread.  Seems safe right now based on the SD, but the VXX will run up much quicker than it will run down.

My feeling is the 21 short strike PUT is probably safe this week.  VIX is down 5.55% to $16.16 right now.  Very low volatility and I can't see it going much lower even if the market breaks this overhead resistance. 

I got the delta on the 27 Call at 0.09.  Probably safer than the 26 even though it is outside the SD.

If you can get a midpoint-ish fill, I would take the 19/21/27/29 and be happy.