All ED30s are the same base spec and model, there was no "Highline" version or anything like that (the seller is referring to the highline option on that particular car). The only differences between them will be what options were added when ordered new.
Im sure someone on here somewhere has a PDF version of the procure which will have the options list. Off the top of my head you have: xenons, multi function stearing wheel, sunroof, upgraded headunit, winter pack, lux pack, DSG, highline computer, parking sensors. Thats most of the major options, there where loads though.