I had a Nikon 4000 for about a week, and before I could install it, a friend tried it out and bought it off me and took it to his home in Thailand. He liked it a lot, and is a very seasoned photographer, graphic designer, and photoshop genius. And he like it a lot. The reason I bought it in the first place (to replace my Nikon LS-30) was because it has the same specs as the Nikon 8000, except it doesn't do 120mm film, and my new Bikini Gold calendar, was scanned on a friend's Nikon 8000 (it was a last-minute necessity, we would normally do drum scans).
OK, so now I'm back in the scanner market too, and would either get another 4000 (although he tells me it is VERY difficult to use properly) or wait for the 5000, or I've been looking into the new Minolta Elite 5400. As in, 5400 dpi! I've seen only a couple imcomplete reviews of it, but they like it. It sells for about $850 at B&H. It seems BTW, that one of the problems with these hi-res desktop scanners is they're so sharp, you see all the grain and dust on your slides, so using their various auto-cleaing utilites is a must.
You might to check these sights for review info (lots of other reviews here too):
As for the Epson 3200, I have seen it, and was considering it primarily for traditional flat-bed scanning (which isn't all that big a deal to me) and scanning 120mm film (since I already had a 35mm film scanner). It is a great scanner, and I have seen unbelievable blow-ups from 120mm film done on its predecessor, the 2450. I put off the purchase because neither of those things turned out to be that critical for me now, and I just don'think it is up to the quality of a dedicated film scanner for 35mm film.
I'll be curious to know what you decide.
Andy Pearlman Studio