Buy or Borrow

This post goes along with my last post about being a bookworm...by the way thanks to those of you who have joined me on goodreads and I hope to see more of you soon!! A little background on this subject. I am a borrower--as far as books go I LOVE the library and almost always have a stack of books from there. I don't like to buy a book until I've read it and know that I love it enough to read again. Jason on the other hand is a buyer...he figures if it's worth reading it's worth buying. Not to say one is better than the other, but if both of us were buyers we'd be even more buried in books than we already are!! ;) So, are you a buyer or a borrower?? How do you narrow down the books you have so you aren't overrun? I find it hard to part with books even if I haven't read them in awhile. Both Jason and I are going to have to figure out how to part with some soon or they will take over our house!