I am about to open a just delivered factory refurb LS-4000 from B&H.
Currently in stock:
http://www.bhphotovideo.com/bnh/con...rch=yes&O=UsedHomePage.jsp&A=search&Q=*&bhs=t
I went through the same deliberations. Thom Hogan says:
For those that are paying attention, the older 4000 ED (LS-4000) seems to be specified almost exactly the same as the newer V ED (LS-50): 14 bits, 38 second scans, not a lot of options. Thus, a used 4000ED is a strong possibility if you're considering a new V ED.
Here is his review of the 5000:
http://www.bythom.com/coolscanv.htm
I went with the 4000 because of it's ability to use the SA-30 bulk film loader. Not that I could afford to pay another $450.00 for it, but because one can modify the SA-21 film adapter to work as one. You may have seen Quinn Porters posts and link concerning this:
http://www.rangefinderforum.com/forums/showthread.php?t=55165
He has the 5000 but the link he provides belongs to a 4000 owner. Both accept the bulk loader.
I decided even I could perform this mod. I have never scanned, and I am afraid I won't like it much. The bulk scanning ability seems a great time saver, and I have read other's statements to that effect.
In recent months I have purchased a Contax G2 and lenses, lots of Tri-X (that just came today too), and am going to give film, home developing, and scanning a go.
But if I can't get a relatively simple workflow going, I know I won't stick with it.
One difference between the two I belatedly learned is DEE. V has it, 4000 doesn't. Hogan talks about this. Also, V has Ice4, 4000 Ice3.
Since this is all so new to me, my plan is to get Vuescan (I have an intel mac with leopard and Nikonscan is due for an update), and perform as few adjustments as necessary while scanning. The Raw feature in Vuescan (pro I think) appeals to me.
I want to get a dust free scan into the computer and work from there in image editors. I am not looking for perfection (How could I with so many variables, all new to me), but would like a better result to my eye for B&W photos over digital B&W.
I'm also looking forward to scanning the B&W negatives I developed in my first photo course, around 30 years ago.
With all the pages I read I never came across any saying the V had greater depth of field. If you can give a link, I would appreciate it. I did read complaints about dof on the 4000. The strip film holder is supposed to help with curled negatives.
Hopefully some actual users will give you some additional feedback.