Camera system selection

What I'm looking for when selecting an SLR camera system:

For travel, I need a lightweight body, a wide to telephoto zoom, and an even wider prime. Ideally, I would want a 15mm prime, and a 24-120 zoom. Unfortunately, nobody makes a system that has these.

For non-travel use, the body can be heavier, and I'd want the same lenses as above, plus a 50mm prime, plus a much longer zoom: 70-200 or longer. I want image stabilization in everything.

In the Canon world, the closest I can come to this system with a lightweight body is:

• Digital Rebel body (1.6x multiplier for lenses)
• Canon EF-S 17-55 f/2.8 IS USM (27-88 equivalent), excellent lens, but not as wide or as long as I would like
• Canon EF-S 10-22 f/3.5-4.5 USM (16-35 equivalent), slow, no IS, but the only lens this wide available
• Canon EF 14mm f/2.8L USM (22mm equivalent), an alternative to the 10-22 above, but not nearly as wide as I would like
• Sigma 30/1.4 EX DC HSM (48mm equivalent), excellent standard lens
• Canon EF 70-200mm f/2.8L IS USM (112-320 equivalent), excellent long zoom lens

If I drop the lightweight requirement, I can get a much heavier and more expensive Canon EOS-5D, which has a full-frame sensor. It's still the lightest full-frame camera available, but weighs almost twice as much as the Rebel.

• Canon EOS-5D (full-frame sensor)
• Canon EF 24-70mm f/2.8L USM, no IS
• Canon EF 14mm f/2.8L USM, no IS
• Canon EF 16-35mm f/2.8L USM, an alternative to the 24-70 and the 14mm above, would also require the 50mm prime below
• Canon EF 50mm f/1.4 USM, standard prime
• Canon EF 70-200mm f/2.8L IS USM