That website is a wreck. I purchased some parts from EOE and everything turned out fine, but I also know that people have had issues with them as well.
I flash modded a 6th gen Classic. I enjoyed the miserable experience, and I enjoy using the iPod for 320k MP3 AUX playback, but honestly I think a modern device probably makes more sense. If not a smartphone with one of the Apple-Aux adapters, maybe something like the NW-A306. Lack of streaming support is bad. No real FLAC / “high-res” support is bad. iTunes is a mess.