For me, it is about 1700 jazz titles on CD. Probably about 200 more CDs (rock, classical, etc), and 50 or 60 LPs (mostly rock) that haven't been played for 25 years. This past year I decided to track how much I spent on jazz CDs. For 2010, I purchased 147 titles for about $1370, or about $9 an album. Not bad given that the list includes a number of the BS/SN compilations, Bill Evans boxes from Amazon/Newbury, etc. Great majority still came from ebay, though organissimo posters were my second most used source.
Nice to see that as a collector, I am a rank amateur compared to so many ...