I went through a phase where all I bought was Classical music, and I did manage to amass quite a collection. Those Naxos recordings are just so cheap. For the price of one regular c.d., I could usually buy like 4 of those c.d.'s. I was always mostly into the more Romantic era pieces with my favorite composers being Mahler, Shostakovitch, Rachmaninoff, Brahms, Dvorak, and of course Beethoven. I like big, over the top symphonies mostly, though when it comes to Beethoven anything is good.
I can’t say with any degree of certainty what percentage of my overall music collection the “classical” music makes up, but I’d say probably somewhere in the 10 - 15% range. I have lots of classical on vinyl because if you go to some big record sales you can often find some damn good recordings for under a dollar.
I still throw on the occasional classical recording when I’m cooking or reading or even gaming, but I’m just not as into it as I once was. My personal most favorite classical piece ever has got to be Dvorak’s Symphony No. 9 “From the New World”…particularly that second movement and I think the theme from that movement is reprised in the fourth movement as well.