COLUMBIA 400 PLT OVERSHOOTS MISSED APPROACH ALTITUDE BY 300 FT WHILE DISTRACTED BY OTHER AIRCRAFT OCCUPANT; ALSO A PILOT; AND THE GPS FUNCTIONS IN USE.

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AFTER I FLEW A PLANNED MISSED APCH AT AN UNCTLED ARPT (CLASS E ABOVE 700 FT AGL) WE WERE AVOIDING NUMEROUS ACFT OPERATING BELOW THE 2000 FT CEILING. WE WERE ALSO PROGRAMMING OUR NEXT APCH. BOTH PLTS WERE ATTEMPTING TO PROGRAM THE NEXT DEST ON THE GARMIN 1000 AND TO AVOID TFC. IN THE CONFUSION; I HAD NOT SET THE MISSED APCH FIX ALT IN THE FMS. WHEN I CONTACTED APCH CTL WITH MY INDICATED ALT I NOTICED WE HAD CLBED MORE THAN 300 FT ABOVE OUR MISSED APCH FIX ALT AND WERE STILL CLBING. BOTH PLTS WERE USING DIFFERENT TECHNIQUES AND SCHEDULES TO ENTER DATA ON THE DIFFERENT ENTRY DEVICES OF THE G1000. I WAS HAND-FLYING THE AIRPLANE TO AVOID AN ACFT ABOVE US; AND TRYING TO MONITOR THE DATA ENTRY ACROSS THE COCKPIT. SUBSEQUENTLY; A COM BREAKDOWN OCCURRED WHEN ONE PLT WANTED TO REPLAY THE LAST CLRNC AND THE OTHER THOUGHT ATC WAS CALLING. THIS RESULTED IN SEVERAL CONFUSED-SOUNDING XMISSIONS FROM ME. I KNEW THE OTHER PLT WAS PLAYING BACK; BUT HE HAD TO GO BACK THROUGH SEVERAL XMISSIONS. IN THE MIDDLE OF THIS I HEARD 'N-- WHERE DO YOU WANT TO BEGIN THE APCH?' THEN 4 OR 5 SECONDS LATER WITHOUT AN INTERVENING XMISSION 'N-- WHERE DO YOU WANT TO BEGIN THE APCH?' SINCE I HADN'T HEARD THAT QUERY BEFORE I THOUGHT IT WAS REAL-TIME AND ANSWERED. THE OTHER PLT INTERRUPTED TO TELL ME IT WAS THE RECORDING. I WAS FLUSTERED AND MUMBLED SOMETHING TO ATC. I AM STILL NOT SURE IF IT WAS A CURRENT XMISSION. A SUPERVISION ERROR ON MY PART. I WAS SUPPOSED TO BE FLYING AS A SINGLE PLT; BUT THE OTHER PLT FELT WE WERE BEHIND IN SETTING OUR FLT PLAN AND STARTED MAKING INPUTS. THE OTHER PLT INSISTED ON USING THE PLAYBACK OPTION AND I WAS TOO POLITE TO INTERVENE. A DESIGN ERROR IN THE G1000. THE 'PLAYBACK' MODE SHOULD NEVER BE USED. IT CAN ONLY ADD TO CONFUSION. IF THERE IS A QUESTION ABOUT A CLRNC; ASK ATC FOR A CLARIFICATION -- USE REAL-TIME ENGLISH.