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(http://dl.dropbox.com/u/16307641/IMAG1010.jpg)
That light box and the lighting look great! Are you taking a lot of keyboard photos lately? How does 28mm work for keyboard photos?
@OP
I don't know much about recent camera systems, but I am pretty satisfied with my D200 + Tamron 17-50 2.8. I take a lot of indoor photography without additional lighting and I appreciated advantages of fixed and fast aperture lens. If your photos are going to be taken mostly indoors, you would probably benefit from lens with faster aperture. Lens with faster aperture are generally heavier, bulkier, and more expensive though.
I am not sure if Sony has a lot of lenses, but if you are going to invest significant amount in a camera system, you might want to consider lens group. If you are not so much into photography and if you are less likely to invest in lenses, you might be fine with a single body and a bundle lens and probably shouldn't worry about lens lineup.