Got the third one a couple of months ago. Need to build up my toy collection, as it will abruptly stop if I meet the right woman. Actually, the right woman for me is going to want an R10 for herself. I've got it covered
I'll only list the serious headphones I've bought since Head-Fi (in order of acquisition):
I'm really not sure. I think the K1000 should be able to keep me intested for a long time, at least until I have enough of an income to get seriously interested in speaker hi-fi. Maybe some new IEMs would be interesting.