I have one or two that turned up during January and February and they flowered fine, all except the echinopsis obrepanda, which i think was too young.
Some authorities on the subject, do say you can pot on or repot at around this time of year, as long as the compost you use is bone dry, as they should be
and don't know much about it, but then they dont always stipulate whether thats all cacti or some. BTW Love this post...my wish list has just gone up, much to prickly's dismay.
You have some wonderful plants there.