About $2000. While my 650 has been a lot of fun, it doesn't have my heart. It's been an excellent learning project both for riding skills and mechanical aptitude, but if someone came along with cash in hand, I'd sell it.
Really, the bike I love is still my first bike, the little 1972 100cc Yamaha kept in the back of the garage that I still ride here and there. It's a delightful little bike and short of giving it to a family member, I don't see myself EVER getting rid of it.
Beyond that, my Dad had a triumph when I was a kid so I plan on eventually getting one of my own. A lot more sentimental value there.