Three wings: 3, 4 and 4.6m2 (I also have a 6.1 which I have never used, it was an impulsive buy) - recently sold a 5.3 and replaced it with the 4.6. If I could do the quiver over, I would go for a 2.6, 3.5 and 4.6 quiver.
Two boards: ML 75L (6'1" x 20") and sinker 55L (5' x 20")
One foil: HA V2 680, 795 performance mast and 140 stab (I use this in everything from 10 knots to around 30 - I don't enjoy foiling either when I start feeling overpowered on the 3m2). And I don't bother if its less than 10-12 knots.
Conditions: waves, flat, DW and everything inbetween. Usual wind range 15 - 25 knots. Weight 83-84kg. 6'2''
I would like to add the Armstrong performance downwind foil 685 for DW winging. And a 4m2 parawing (plan to sell the 6.1 and buy this).
@Bryan to answer your question, I don't need a bigger quiver of a specific element, the combination I have has taken 4 years to get to and for now, serves me very well for our local conditions. Maybe you could consider the wings plus parawing as a quiver.
Also, I only wing.