Yep, there aren't any Varacosa on BugGuide yet unfortunately. I've actually been meaning to upload Dr. Stratton's image, just so that the genus can be represented there by at least one example. She gave me permission to do so with her images, it's just been a matter of getting sidetracked and not doing it yet. Our other admin/staff here (Eric) and myself are both also editors over at BugGuide so we add info there when we can; coincidentally, the link you just posted to the forum was to a thread that I started a few years back.)
The scientific documents for every known species are out there, they're just tricky and sometimes time consuming to find (or really old and outdated). Yep, sadly the Nearctic Spider Database (the Canadian link you mentioned) had a major crash and is no longer online. Getting to know/understand Norm Platnick's "World Spider Catalog" is the key to finding relevant information on every known species (it lists the citation of every published paper so you can find it elsewhere). Scientific papers usually only show the genitalia and give a brief written description, but sometimes there are additional drawings to help.
It seemed like you might have been interested, so here's all the most recent papers on the 5 species of North American Varacosa:
I'm glad you have such an interest in spiders! Spiders fans are few and far between! And, oh yes, using other photos online to identify things is really, really, really hit or miss. Lots of people take pictures of spiders, but few people can accurately identify them... so this results in a TON of mislabeled spiders online. There are even errors in field guides on occasion (and there aren't very many field guides on spiders to begin with).