You are walking in circels my friend:
The 350D is too tiny: So you want a heavier camera (5D is 325g heavier).
The 24-105/4L is too heavy: So you want a lighter (and poorer lens). You will save.... 350g.
Don't buy 4 L lenses, one is enough. As a beginner you don't really need the 28-300mm zoom area. In time, with more experience you will learn that you don't really need a big zoom area.
If you only buy the 5D because of the viewfinder you are on the wrong track. My advice is that you buy a Sony Digital Cyber-Shot R1. It has a big zoom area and makes sharp pictures. You will actually get sharper pictures than with a 5D with a Sigma 28-300mm. For the rest of your money you can buy something else. What about lots of Chocolate?
The 350D is too tiny: So you want a heavier camera (5D is 325g heavier).
The 24-105/4L is too heavy: So you want a lighter (and poorer lens). You will save.... 350g.
Don't buy 4 L lenses, one is enough. As a beginner you don't really need the 28-300mm zoom area. In time, with more experience you will learn that you don't really need a big zoom area.
If you only buy the 5D because of the viewfinder you are on the wrong track. My advice is that you buy a Sony Digital Cyber-Shot R1. It has a big zoom area and makes sharp pictures. You will actually get sharper pictures than with a 5D with a Sigma 28-300mm. For the rest of your money you can buy something else. What about lots of Chocolate?