In reply to BnB:
I'm a bit old fashioned re the choice of wires I carry - all WC rocks plus a set of DMM brass offsets - but it works for me. I rack the rocks on 4 colour coded krabs (WC featherlights from the 80's - long since withdrawn from sale because of their sharp 9mm radius and low gate-open strength). I rack 10,9,8,7 - 9,8,7,6,5 - 6,5,5,4,4,3 - 4,3,3,2,2,1,1. The overlaps mean I seldom pick the wrong set (at least until I'm a way up the pitch) and I can drop any of the sets and still have a full range (Rocks 1 and 2 are overlapped by my brass offsets and rock 10 by my smallest hex. I rack all the wires on one side but near the front so I can reach with either hand.
I'm seriously contemplating breaking my 20 year old system and investing in some DMM offsets in larger sizes, but I'm not yet convinced they will work better than Rocks 4 and upwards placed sideways.
It's all personal preference of course.
Martin