Chris, I tried out a lot of CMS’s before arriving at MODx. A lot of them have more 3rd party plugins and a lot of them have (arguably) a more mature/polished UI. But none of them made as much sense to me as MODx, and none of them were as easy to customize. The downside is that the community here is smaller (but growing!) so the documentation tends to be scarcer and less groomed.
If you’re not much of a coder, you can still get a lot of mileage out of the Snippets that are available in the repositories.
SVN is a version control software package, by the way... it’s often used to track coding projects. I do a lot of coding, and I’m still crusty with using SVN to check out and check in files. If you’re up for it, you can download the latest version of Revolution and install it to see how it looks... but it’s not a polished release yet, so you’d be flying a bit in the dark.
I’ve been putting together tutorial videos for MODx on one of my sites:
http://www.tipsfor.us/