from memory there are a few major hardware differences between V600 and V700.
That is, both in terms of supplied accessories and internal hardware quality.

Can't really remember tho, it was a very long time ago that I looked into it.
For my purposes tho(as in what I wanted to do) I found that a bellows with slide copy attachment was the cheaper and easier way to go about copying and digitizing 35mm film.
(I don't have any larger format needs).

Most simple lenses work well with these devices, the hardware can usually be found on ebay for not too much, and once your done you have a very flexible macro setup to also play with(if the interest is there).

The only issue with my choice to save some money and not get the scanner, is that eventually(after the fact) .. I had a need to copy a huge pile of documents .. and of course had no scanner to do so.
(that problem was solved via the use of the work copier/scanner )

Something I found handier in using the bellows/copy attachment was the end result of having raw files to play with, rather than tiff files for more processing headroom.