OK those are a LOT of assumptions. First and foremost, I'm not sure I'd assume you need zooms.
My theory:
I carry a small cross body bag with ONE body, two lenses, and a portable harddrive (for offloading CF cards) that's it. I do macro and landscape work. Those two lenses are a 90mm prime macro (my precious!) and a 24-135mm zoom. (Will someday upgrade this second to the Carl Zeiss lens, but that's later)
If I were doing street photography I'd ditch the bag and hang the camera around my neck with a good 50mm and stuff cards/batteries in my pockets.
But if I really needed to reduce weight I'd be carrying a 20mm prime (for landscapes) and my 90mm macro and move MYSELF to get the shots I want. Also, all the full frames out there have so many damn pixels that you have a good deal of crop room. So if the 20mm is a little too wide big deal, just crop it out.
My suggestion:
If you haven't found sites like DPReview start googling. They offer in-depth reviews of cameras and lenses, and side by side comparison charts. The forums can also be good sources of information, but remember that every camera camp has its religious adherents and we tend to hang out in forums.
Google reviews of each body you are considering until your eyes cross. Make pro and con lists. Here's the thing, they're all good. And they all have cheap glass, medium quality glass, and "holy crap its HOW MUCH" glass.
Prime will be cheaper than zoom for the quality. If you can learn new ways of shooting (actually OLD ways of shooting from before zooms were so ubiquitous) you can do quite well no matter what you pick. If you are on budget the big thing is to pick ONE system and stick with it. And all those lenses you may have collected from other systems, sell to buy good glass, really good glass.
Sony has CZ zooms which are amazing. Canon has amazing zooms (my husband has some), Nikon I'm dead sure does too (I don't know any Nikon shooters).