Thanks so much for the help! While the case in the second build is absolutely fascinating, it's a bit overkill for my needs ;) I ultimately put the 2070 Super and the fans from the first build into the second build, and all of my parts are being delivered tomorrow!
I especially like that the parts you recommended are far better values than anything I'd been considering, so I guess that's effectively what I hoped for coming here =)
I went through reviews on all of the parts and I think the only concerning thing is the recurring comment about having to start with a fresh install on the Sabrent drive; luckily, I tend to prefer starting fresh with each build and the bulk of my stuff will go on the Seagate.
Many thanks for the details here! This is the kind of thing that I haven't yet figured out how to gauge...and the kind of thing one needs to know when there's a budget in place lol