Hi Terry,
I'm interested in other opinions and then willing to make some decisions.
When listening to very busy/congested airspace, such as what is found in the IAD area (I'm familiar with it), my personal preference is to concentrate on one "area" like Tower or Departure or Approach, not necessarily one over the other but not all at the same time. This way you can follow what is going on in at least that one area, as opposed to multiple busy sectors that just end up blocking each other out.
Although not my preference the most popular feeds seem to be Tower, as far as traffic volume goes, your feed would be excellent if you just monitored the two Tower frequencies only.
Based on traffic volume, other configurations that would work on their own:
1) Departure: 126.650, 125.050
2) Approach (initial): 126.100, 124.650, 120.450
3) Approach (final): 125.800, 134.200, 128.800 (status?)
4) Approach (high): 125.650, 118.675, 123.825
My personal preference would be option 2) the initial arrival sectors, option 4) would be good too but I doubt there would be much interest. Combining any of the above options would be too busy. Of course this is just my own opinion and I fully respect that others might not have the same preferences.
These are just "suggestions" and I'm certainly not "expecting" or "demanding" anything. It's refreshing that we can have an intelligent discussion on frequency selection here in this "discussion" forum. Thank you for your excellent response and nice job on the feed setup !
DJ