Discussing with a friend about ADS-B options, we started talking about the GNX 375 for a Cessna 150 with the original KX-170 Nav/Com and an AT-50 transponder. Since neither of us is Instrument rated (I am planning on pursuing it soon), we have no first-hand experience to say how much the single comm setup will add to the pilot workload. In that situation, I would definitely carry a handheld in case of failure, but that does not do much good outside of emergencies. How much would a single comm radio add to the pilot workload in a single pilot IFR scenario? Would you be willing to take that on an IFR flight plan often enough to justify the extra $4k of a GNC375 over a GTX-345 transponder?