Hmm. Just a few words in support of the Scan Dual IV. Firstly, ICE has nothing to do with QC, IQ or anything else except convenience. I've used ICE on several machines and never without some degradation of the image. Perhaps Silverfast's iSRD is better - it's certainly more configurable; but it's so slow that I'd sooner spot by hand.
As for colour rendition, that's kind of irrelevant unless you plan to use your scans directly from the scanner, with no PP. Does anybody really do that these days?
Dynamic range is specified as 3.6 - less than the best Coolscans, but as good as any consumer film scanner on the market today. Of course, everything depends on how you set up the scan, and, unlike many scanners, the K-M allows per-channel exposure adjustments prior to scanning.