KPA100 wins hands down. The KXPA100 won't integrate with the K2 nearly as well as the KPA100 which was designed for the K2. There's nothing the KXP100 can do for the K2 that the KPA100 can't do....better. -- R. Kevin Stover AC0H ARRL FISTS #11993 SKCC #215 NAQCC #3441