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Personally, I think you're better off investing in lenses rather than cameras. The 600D might be newer than the 400D but it's not that much more advanced and it'll never make as much of a difference to your photographs as better lenses.
You said you shoot in low light, but you haven't said what. You also said macro and landscapes. You also said you have a few cheap lenses but you've not said which ones.
For £1000, I'd buy a Sigma 10-20mm for landscapes (£385 and WEx), a Sigma 30mm f/1.4 for "low light" (£379 at WEx) and a Sigma 50mm f/2.8 macro (£269 at WEx). Thats £1,033.
If you could stretch to another £100 I'd replace the Sigma 50mm macro with the Tamron 90mm.
If you'd like something longer but still fast, swap the Sigma 30mm f/1.4 for the Canon 85mm f/1.8 which is £75 cheaper at around £305.
That gives you wide, fast and close and that covers just about every scenario you've listed.
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