Some of Canon's longer lenses have AF preset, which works something like a lock, if I'm not wrong, by limiting your focus to a preset distance. But needless to say, these lenses are the big, heavy and expensive ones.
Anyway, I agree with the others about going with Canon or Nikon. For Canon, you have either the 350D or 400D, both of which are cheap but good cameras.
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Canon 350D, 18-55mm 3.5-5.6, 50mm 1.8, 100mm 2.8 Macro, 75-300mm 4-5.6, Sigma 10-20mm 4-5.6
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