best filter layout for narrowband

[mgirdwood]

Hi, 

Currently i have a 5 slot filter wheel and would like to try to gain some narrow band image experience now. have just acquired some filters,  The problem is that i have  L R G B Ha OIII but not enough slots for all until i can afford an 8 slot EAF and an SII filter.

What would be the best layout to ensure i have a chance at the best data  combination ?   L Ha OIII Blue or stick with R G B Ha OIII, although i do have an Hb filter somewhere to add to the mix if that would be useful for the blue channel.  the target would likely be the Witches Head due to my restricted views South.

camera is the ASI 1600MMpro if that makes a difference.

Thanks for any help - Mark