Plant what you think you will use. Most of the time, Cascade and EK Goldings will be flexible.
Some varieties do fair than others. I have had Nugget hops for 5 or 6 (maybe more) years and they are one varieties that is most disease resistant.
Lots of place carry them. I've used:
Freshops (which carries the jumbo-sized ones, too):
https://commerce.peak.org/vh/f/freshops.com/cgibin/shopper.cgi?search=action&category=RHIZ&keywords=all&template=Templates/rhizomes_storebuilder.htmlBut Northern Brewer and many other national places will carry them.