Well, here in the UK the choice is made easier by the bizarre fact that I can get the A75 cheaper than the A70.
Looking at the extra 16MB of memory on the card alone, I personally don't think it's worth paying extra cash for a measly extra 16MB as whichever of the 2 cards you get (either 16 or 32), you're still probably going to have to buy an extra 128MB card anyway....32MB is still too small to be enough, imo.
However, the A75 does have some slight improvements over the A70, highlighted in the review on this website. And in a few months time, after you've had plenty of enjoyment from your new A75, you'll have long since forgotten about $20.
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