Daniele,
If you have a rental house account, you might find that renting some lenses works well. I rent lenses that I don't use more than a few times per year. If I see that I'm renting a bit much, or that I really love a particular lens, I try to buy one, otherwise, the other photographer's who rent it share the cost of the occasional use. The downside is that if you do a lot of weather-dependent work, you might not have the lens you want at the right time. Through experiments with rental lenses, you'll find out quickly which lenses are working best for you.
You might also look at your work to consider whether you're doing best with slightly longer or shorter lenses in general, check how you see things. Do check your bellows specs on your camera to ensure that they can handle the focal length you wish to use, be that long, normal or short.
Rob, I wouldn't mind the weight of a 600C - if you get one and then decide it's too heavy to carry, you can always donate it to me! The weight of a lens isn't always that important if you're not hiking or walking around much.
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