I'd be happy to do some trading in the spring. do you have seedlings of the things on your grow list or is that just what you grow?
The Echinopsis atacamensis looks like it'd be an AWESOME plant! Does it grow as slow as a Saguaro?
The Tacinga's look like they'd make a nice addition to a collection as well.
I'm sure If I took the time to look it over closely, I'd bet there's an Opuntia or two that would also make a nice addition.
I will have a few you may like, come spring. Harrisia fragrans and O. cubensis are two of my latest acquisitions that you may like. But we can talk more closer to spring.