I have to chime in. Nothing against Canon, but you need to look at all possibilities. I think most Nikon cams will get you a mm or 2 closer than the Canons in Macro mode. Not a big difference, but something. Here's a few of my favorite pictures with my Nikon Coolpix 995.
This is an Albino Japanese Ratsnake; a cultural treasure in Japan.

Mt. Fuji, Japan.

Some shed skin.

After a rain in Kure, Japan.

Jungle Albino.

Male Hypo Tangerine x 2


My SHCT from the Urban Gecko

Jungle Albino Boy after mating

And lastly Albino Eye Closeup

In all honesty, I don't know that the Nikons are better than the A70. Both Canon and Nikon (and Sony and Olympus most of the time) make great digital cams and you probably won't go wrong with any of them. Just don't buy a Mavica that takes a floppy disk and you'll be happy 
Good luck
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Rob Jenkins
herpcam.com