Option 3, or don't waste your time. Running your vinyl setup through an AD converter defeats the whole purpose. If you just want to have access to your music on vinyl, it would make more sense to record/rip your records one time to get them digital. But if you want the sound quality of analog, you should really get an analog preamp and phono stage.
Also, before you connect balanced and SE components to your amp at the same time, make sure you can do so without damaging your equipment. I know there's a switch, but still make sure.