Weekly Iron Condors - best fits for my trading

Some candidates for the weekly Iron Condors

EEM:
EEM 7 Mar 14 (W) 38.00 Put
EEM 7 Mar 14 (W) 38.50 Put
EEM 7 Mar 14 (W) 40.50 Call
EEM 7 Mar 14 (W) 41.00 Call
Number of Contracts: 20
Net Credit: $240
Expire: 7 days

EWZ:
EWZ 7 Mar 14 (W) 38.50 Put
EWZ 7 Mar 14 (W) 39.00 Put
EWZ 7 Mar 14 (W) 42.50 Call
EWZ 7 Mar 14 (W) 43.00 Call
Number of Contracts: 20
Net Credit: $180
Expire: 7 days

GLD:
GLD 7 Mar 14 (W) 125.00 Put
GLD 7 Mar 14 (W) 125.50 Put
GLD 7 Mar 14 (W) 130.00 Call
GLD 7 Mar 14 (W) 130.50 Call

Number of Contracts: 20
Net Credit: $160
Expire: 7 days

SPY:
SPY 7 Mar 14 (W) 181.00 Put
SPY 7 Mar 14 (W) 181.50 Put
SPY 7 Mar 14 (W) 189.00 Call
SPY 7 Mar 14 (W) 189.50 Call

Number of Contracts: 20
Net Credit: $140
Expire: 7 days

UNG:
UNG 7 Mar 14 (W) 23.50 Put
UNG 7 Mar 14 (W) 24.00 Put
UNG 7 Mar 14 (W) 27.00 Call
UNG 7 Mar 14 (W) 27.50 Call

Number of Contracts: 20
Net Credit: $100
Expire: 7 days

VXX:
VXX 7 Mar 14 (W) 40.50 Put
VXX 7 Mar 14 (W) 41.00 Put
VXX 7 Mar 14 (W) 47.50 Call
VXX 7 Mar 14 (W) 48.00 Call

Number of Contracts: 20
Net Credit: $220
Expire: 7 days