Kona and Rocky both make great bikes, can't go wrong with either. The entry level FS Rocky, the Fanatik
, goes for about 2100 I believe. Note that the components speced on the Rocky site are wrong, looks like the mix from one of their FR hardtails. The Kona Kahuna Deluxe
is slightly less and is speced similarly.
Main differences I see is that the rocky has a better frame (hand welded easton tubes, slightly lighter than the Kona according to the guys at my LBS) and better wheels (hand built wheels with Mavic 221s and DT spokes) while the Kona has better drivetrain components (XT/LX vs LX/Deore). Also I find that between Kona and Rocky in terms of 'in-house' components (stems, seat posts, bars...) the Rocky components are much nicer.
Give them a try and see which one floats your boat. Again, can't go wrong with either... I ride a Rocky, wifey rides a Kona.