Costco just lowered their price on the Oly E-410 two-lens kit to $600, plus they toss in a 2G card and some kind of bag.

This is the lightest dslr on the planet, and for the money this deal can't be beat. The "kit" lenses are quite good for the price.

That's what I'd get if weight is the prime concern. I've had the E-510 for half a year and love it.
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--Rick