I've yet to find anything that approaches the sheer beauty of "Opalescent" (afraid I rate this as his finest hour, "Insides" being a bit too Aphex Twin at times for my ears). Check out his mates on the Just Music label: in particular, Digitonal's "Save Your Light for Darker Days" is another spellbinding album. If you're a fan of layered, electronic music with melody, then Bluetech's first three albums ("Prima Materia", "Elementary Particles" & "Sines & Singularities") are a dream (drifting into the "PsyDM" genre here), and likewise Shulman (esp "Endless Rhythms of the Beatless Heart"). On safer downtempo territory are Kuba (esp. "Through a Lense"), M-Seven (both "Activate" and "Stimulus" are fantastic albums, with the former maybe just having the edge), and Nacho Sotomayor (huge back catalogue of Balearic mix stuff, but his own "Interior" is very very good). If you want to take a few tentative steps from Jon Hopkins towards blissful dub, then try OTT's "Skylan" and anything by Sounds from the Ground ("Terra Firma" and "Luminal" their best albums IMHO, although the track "Speedbumps" off their (patchy) "High Rising" album is worth downloading alone. Finally, it goes without saying that you must surely own everything that Boards of Canada have ever done; they cannot set a foot wrong as far as I'm concerned. If you don't have any, their most recent ("The Campfire Headphase") is their most accessible, and will lead you nicely into their first two full length albums. On headphones, and with repeated listens, it's utterly mesmerising. One last thought is www.soma.fm and Groove Salad. Listening to this (free, no adverts) online radio station has introduced me to more fantastic music in the last year than in the last decade! Good luck!