I've heard very good things about the Nikon Coolscan range, but then I also saw one on ebay last week get upwards of $5000.
Personally, I've got the Epson V750 Pro. They're not available in Australia, I got it via ebay second hand for a bit less than the v700 costs here new ($600 or so). Being on Linux, I've never used the Silverfast that it came with, I've got an iscan driver that lets me scan up to 3200dpi. This gives about a 15mp FF file, not many films resolve that high anyway and I tend to use high-iso B+W and/or expired cross-processed junk films. That said, I put a roll of Velvia 50 through my Mamiya 645 and got some very nice 40MP files (and I could get 10 of the same camera for the price of a D800).
Scanning 4 strips of 6 35mm in a batch is easy enough in the v750, then taking a huge 200mb file and cutting it down into individual shots is what takes me the time. The inbuilt holder that came with it is good enough for a triage-operation at least, and for snapshots. The 120 film holder, just because it's a holder, the negs can sag in the middle and affect sharpness. So I've bought myself a Betterscanning.com wet/dry holder. I haven't tried the wet-mounting yet, but even dry-mounting (using Magic Tape) has an amazingly good impact, it's just so much sharper and highly recommended to anyone who is serious (but on a budget).
I've read the i-photo review of the v600, and considering it's half the price of the v700 new, it's worth a look, but the v700/750 is just better for films. As for v700 vs v750, I don't think there's much real difference except the Multicoated glass (anyone ever tried both?)