I already have $160 KPC3 tnc. I stay with the tnc pi at $40
You don't get GPS, real time, and two 9600 baud ports with the 20+ year old KPC. Not to mention the ease of running the latest and greatest software. How's the FEC FX-25 working these days on the KPC?
Our real problem is still finding a radio good for 9600 or even 19,200 for a reasonable price.