I am considering upgrading my A100 to one of the above. I already own an A350 which I am extremely happy with. As you know, my main interest is doing low light band photography, so wonder, given that criteria, which would be best. I've read a few reviews of both, but am still undecided, though starting to lean heavily to the A550 because of its live view and larger mp (14, as opposed to 12 for the A700). I read the previous links (here and here), but the second link tends to err more to the A500. My Sigmas 18-50mm, 28-80mm and 24-70mm F2.8 lens's work fine on my A350, so don't think I'll have any real issues with gear stripping on either the A700 or A550 (unless someone knows different) Does anyone have any further thoughts or recommendations.? Thanks in advance.