I have a 1643 (one year old tractor) with approximatley 150 hours on it. I can't say that mine has been trouble free. However, my dealer has stepped up to the plate and fixed any problem that I've had, so far.
Get the skid steer bucket. I tried to save some cash and went with the MF standard bucket, pretty much junk. The MF bucket is extremely light duty and the tractor can easily out work the bucket. The MF bucket on my 1240 was matched much better to the tractor.
Overall, the 1643 is a pretty good tractor. Even with the issues that I've had, I would still buy it again. Maybe, I would have gone a little bigger?