I feel that the KN2600 would be your best bet. It has nearly everything the kn7000 has that you would want to use including usb and SC cards. It is light weighing only 26 pounds yet has a built in sound system that is very good and adequate for most use.
If you feel you must have a floppy drive then the KN2400 has that and the KN2600 does not, nor does it need it in my opinion
You could pick up a KN2600 used for around 700.00 USD plus freight, maybe less if you shop enough, well less then half the cost of a KN7000.