So this is not at all the cheapest option, but if you have a Synology NAS (which are just absolutely fantastic, imho), you can use Note Station. It's very much like Evernote in terms of design and capabilities (though still young), and it has a very straight-forward importer for Evernote notes. I use it as a backup for Evernote. Note Station has mobile apps and web clipper extensions for the browser as well.

Since this resides on your Synology, it's not stored in a cloud service. Depending on your viewpoint, this can be a pro or a con. It also doesn't have a native app, and I have no idea how it does with 8,000 notes.

I do know they're continuing to update it, and I truly hope they add features like Markdown support. I personally use Evernote still (and using Alternote for the actual note taking part), but could see myself switching if Evernote ends up losing my notes or something.