I don't know if this is the right place for this. Last year I bought a Canon 5D primarily for its low light capability. I haven't exploited that yet as I'm not in the right place for it, but I'm already becoming disillusioned with the camera. The problem is simply that here on an island in the Caribbean it keeps filling up with dirt, and I'm tired of having to clean the entire inside of the body - sensor, mirror, prism, screen - after EVERY shoot. So I'm thinking of alternatives. A Canon 1Ds III would enable me to use my existing lenses, but as I only have two so far that need not be a deciding factor. And I've read a few vaguely critical comments about the camera, though it should work superbly in low light. Kinda pricey, of course. Friends here who have Nikons seem to have no dirt problems, so I'm wondering about a D3 or maybe a D700. The key attribute being very good low light performance. I've read reviews that suggest that more mp than on the D3 give no benefit, and the D3 is in every way equal to or better than the 1Ds III. I'm too new at this game (digital SLRs) to have enough experience to judge for myself. Can anyone help?