when i buy, i'll buy used.....
any reason to avoid the early models? ie, the 02-03 V, and/or the 04 Wee?
you always hear of bugs in the early models....wondering what the experience has been.
The clutch on the early 1000's was about the only real problem, but the new 'improved' version wasn't a total fix anyway. Search the site - you'll find people who can fix that now anyway.
The later 650's were a BIT better than the early models (twin plugs, slightly more electrical capacity) but nothing that'd make me scream "nooooooooo!".
Unless they are real low k's budget on a new rear shock if it hasn't been replaced already, suspension is the weakest point on all them, and the stock rear is usually pretty much dead at around 30,000k's but again, has easy, relatively inexpensive fixes.
On all models, check that the drain holes from the spark plug wells are clear, and a relay kit for the headlights is cheap and you'll avoid most of the potential electrical problems that come up with age. The 650's seem capable of 100k miles, (I sold my K6 with 120,000k's on the clock) the 1000's 200k miles without rebuilds (possibly more) - not all will live that long, but some definately have.
So, nothing that's a show-stopper, and nothing that's you must fix that NOW on any model.