Andrew, excellent. Thanks for the link.
I also went and looked at the Adox website and they do now make CMS 20 in 4x5. That would really be a good choice for what I'm doing. I don't know where to order it in the US, but maybe Freestyle will start to carry it now that the CHS Art film is no longer available.
Thanks for the great ideas. I'm new to APUG and I have to say I'm very very impressed.