Out of interest Neuro, do you have the 8-15mm ?
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There is a Canon 18-200, it was initially expensive, and not all that good. 11:1 zoom lenses are a compromise, particularly if you want a reasonable price and a lens that is small and light weight.
I'd suggest a 6D, reduce the number of lenses, and replace any large lenses with smaller equivalents. I have no idea what you shoot, but tele lenses could potentially be replaced with a 70-300L, and mid range lenses or zooms could be replaced with a 40/2.8.