I'm with you - still searching - and trying to find space for the bags I thought were great...
Right now I'm favouring my Tamrac Tele Zoom lens bag (Pro Digital Zoom 7 or 9) and then I attach a lens case to either side - selected in size for each photoshoot to fit the two extra lenses I limit myself to bring.
When I carry more I go for a belt with lens cases attached, and a tele zoom bag. I know, it looks weird, but at least my back doesn't hurt, and I can get to the gear!
These outfits can also hold my 645 equipment, when I do film. Very handy.