I'm surprised nobody has mentioned getting targets from Wolf Faust (
http://www.targets.coloraid.de/). I've purchased from him a couple of times, and I'm very happy with the product and service. Standard disclaimer: I'm just a happy customer, I don't have any financial stake in his operation, etc.
Keep in mind...IT-8 targets are an international standard. You can buy an IT-8 target from any vendor, and use it with any software package that supports IT-8 profiling, as long as you use the correct reference file from the target vendor. Silverfast's prices are a bit expensive for some targets, IMO.
Wolf Faust (and other sites on the web, as well) maintain that you need different targets for Kodak and Fuji E-6. I'm skeptical, as I would have to imagine the spectral response of the dyes is very similar between Fuji and Kodak, though I've never run any definitive testing. Most people agree that you need a Kodachrome target if you're going to scan Kodachrome, as those dyes are significantly different. I haven't used SilverFast's Kodachrome workflow, though I think it's just merging 2 scans with different exposures to dig a little deeper into the shadows, which can be done, in principle, with other scanning software as well.
Lastly, you can generally profile with just a 35mm target (which tend to be cheaper). This is what I did for my Epson V750. You sacrifice a *tiny* bit of accuracy, since the 4x5 targets are typically individually read to generate the reference file, whereas the 35mm targets are "batch average". Some manufacturers will create 35mm targets alongside 4x5's on a larger sheet of film, so in those cases, the process control is very good.
Hope this helps--
Greg
