One of the few comments I've found that concern me are Waynes about the warm tone that should be neutral. That would bug me!
Jack,
I'm using Spyder3 Print here to generate profiles for an Epson 3800 printer, including B&W profiles. The results are very good, although not in the same league as MonacoProfiler, ProfilerMaker and i1Profiler. One of the advantages of this package is the ease of exporting results. I'm learning a bit of ArgyllCMS and hope to start building profiles with it and the Spyder3Print measurement device soon.
To print B&W, I use the advanced B&W mode of the Epson driver with simple linearizing B&W profiles created using the QTR-Create-ICC utility that comes with QuadToneRip. Spyder3Print can export directly on the format required by QTR-Create-ICC. You can read a bit more about it
here. Results are far better this way than by using color mode combined with any profile I've generated.
The resulting ICC profiles should help you with soft proofing and also improve B&W response, specially for non-Epson papers. I don't have any experience with your RIP, but I assume you could generate B&W profiles the same way, if it has a dedicated B&W mode.
Overall, i really like the Spyder3Print, specially considering the price.