Here are a couple filters that would probably work well for you.
http://www.waterfilters.net/culligan/wholehouse/replacement_filters/P5.htm http://www.waterfilters.net/Pentek/wholehouse/Carbon_Filters/CBR2-10.htm
I might mention that your flow rate and pressure drops would be better if you had bigger filters.
The 10 inch BB would probably be a little better for you.
http://www.waterfilters.net/Filters/wholehouse/wholehouse.htm
Thank you,
WaterFilters.NET