B757 FLT CREW ALIGNS WITH WRONG RWY ON NIGHT VISUAL APCH. REALIZING THEIR MISTAKE; GO-AROUND IS EXECUTED.

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CREW FATIGUE; PF LACK OF USE OF AUTOMATION/RAW DATA AND BOTH PLTS NOT FAMILIAR WITH THE LAYOUT OF THE E SIDE OF DFW (NOT SEEING RWY 17L WAY OFF IN THE DISTANCE AND TO THE FAR L OF RWYS 17C/17R DOES NOT GIVE YOU A CLR MENTAL/VISUAL PICTURE OF THE E SIDE DFW ARPT LAYOUT). ALREADY A VERY LONG DAY WITH EARLIER DFW WX CAUSING A DIVERSION TO OUR ALTERNATE ELP. RETURNING TO DFW FROM ELP; WE WERE GIVEN A SLAM DUNK VISUAL APCH TO RWY 17C. FO WAS FLYING AND WAS READY (STABLE) AND CONFIGURED FOR THIS. EXTREME RADIO TFC CAUSED THE APCH CTLR TO HAND US OFF LATE TO THE TWR JUST AS WE WERE TURNING A 4 MI FINAL. I FIRST SELECTED/HEARD THE WRONG TWR FREQ WHICH CAUSE MORE LACK OF AWARENESS FROM ME AND I EVENTUALLY GOT THE CORRECT TWR FREQ. AGAIN; THE TWR WAS EXTREMELY BUSY AND WE RECEIVED A CLRNC TO LAND ON RWY 17C ON ABOUT A 2 MI FINAL. DURING THAT TIME I HAD NOT NOTICED THE FO (PF) HAD TURNED OFF ALL HIS AUTOMATION INCLUDING HIS FLT DIRECTOR AND HE HAD ALIGNED UP WITH RWY 17R MISTAKENLY. MY FLT DIRECTOR/LOC SHOWED WE WERE R OF COURSE. WITH MYSELF BACK IN THE LOOP; WE ARE NOW ON A 1-2 MI FINAL; I QUESTIONED THE FO 'CLRED FOR THE VISUAL/LNDG 17C CORRECT?' HE STATED; 'YES IT'S THE ONE WE ARE ALIGNED UP WITH.' I NOTICED AN ACFT IN POS ON RWY 17R. I STATED 'THIS DOES NOT LOOK RIGHT' AND I SAID 'GO AROUND.' NORMAL GAR AND LNDG FROM THERE. FO LATER STATED AT THE GATE; THAT THE ACFT IN POS ON RWY 17R APPEARED TO HIM TO BE THE ONE WE WERE TO FOLLOW TO RWY 17C AND HE USED ONLY VISUAL CUES NOT HIS LOC/GS PROVIDING RAW DATA. AFTER THE NORMAL GAR; I CONFIRMED WE HAD THE CORRECT ILS TUNED AND RECONFIRMED THE LAYOUT OF THE E SIDE OF THE ARPT. I ADVISED ATC THAT WE BELIEVE WE ALIGNED UP WITH THE WRONG RWY (17R). NORMAL GAR AND LNDG. WHEN YOU HAVE A LONG DAY; YOU'RE TIRED. I BELIEVE AUTOMATION IS YOUR BEST FRIEND. USE IT TO YOUR ADVANTAGE. CONFIRM VISUAL CUES WITH RAW DATA (LOC/GS). TRY TO KEEP BOTH CREW MEMBERS IN THE LOOP OF YOUR USE OF AUTOMATION. DON'T LET MINOR THINGS DISTRACT THE PLT MONITORING.