Re: Heidelberg Nexscan F4200
Look for a user named "carum" (I think he is active on this board as well, at least on the German one) - he is using a Nexscan.
It is considered one of the best flatbed-scanners ever made.
Heidelberg/Linotype-Hell also offered "Budget" (<<20k$) Versions of their Scanners and so did Creo. They shared support and Software with their "big brothers" but design and manufacturing was outsourced (to Umax and other consumer-scanner-manufacturers).
The Jazz is such a device, it has not much in common with the real Eversmarts manufactured by Creo.
I would go with the Nexscan or a real Eversmart. The Nexscan and Topaz (predecessor) were limited to 8000 pixel wide (~2000ppi @4x5) scans, because they were unable to stitch in X & Y-direction, to achieve larger files, you have to scan several times and stitch in post.
Karl Hudson still offers some Support for the Nexscan and Linotype-Hell Drum scanners.