COMMUTER PLT OVERSHOOTS ON BASE TO FINAL. LINES UP WITH WRONG RWY.

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IT WAS A TYPICAL SATURDAY. FIRST FLT OF THE DAY. AT PHX; WE USE TERMINAL 3. ON THE S SIDE; SO TYPICALLY PREFER TO USE THE S RWY. WHAT TWR USUALLY DOES (SINCE WE ARRIVE FROM THE N) IS TO OVERFLY THEN DSND ONTO DOWNWIND. THIS DAY WAS NO DIFFERENT. I WAS TOLD TO DSND TO TPA AND FOLLOW AN MLG ON FINAL WHO I DID NOT HAVE IN SIGHT. BEING A LOW WING AND ON THE FAR SIDE OF THE ACFT; THE OTHER ACFT WOULD HAVE BEEN UNDER THE WING AND IMPOSSIBLE FOR ME TO SEE. AS I DSNDED AND TURNED ONTO DOWNWIND; I CALLED THE OTHER ACFT IN SIGHT AND TWR RESPONDED BY CHANGING MY SEQUENCE TO 'I'LL CALL YOUR BASE.' NO PROBLEM. SO TWR CALLED MY BASE FOR ONE DEP; AND I DID A NICE SHALLOW TURN TO THE RWY. AS I STARTED MY TURN; THE RWY WAS IN SIGHT. AS THE TURN CONTINUED; THE RWY DISAPPEARED AS VISIBILITY IS POOR IN THE SMA. ROLLED OUT ON FINAL AND EVERYTHING LOOKED GOOD UNTIL TWR CALLED AND TOLD ME I APPEARED TO BE LINED UP ON THE WRONG RWY. SURE ENOUGH; I TOOK A CLOSER LOOK AND IT WAS TRUE; SO I SIDESTEPPED TO 8R AND LANDED UNEVENTFULLY. FORTUNATELY; IT WAS VERY QUIET SO I DID NOT CAUSE AN INCIDENT; BUT THIS COULD HAVE BEEN NASTY. FACTORS: ATC CHANGING MY SEQUENCE TO CONTINUE DOWNWIND MADE ME RELY ON THE CTLR RATHER THAN LOOKING OUT THE WINDOW FOR MYSELF. I FLY INTO SKY HARBOR ALL THE TIME; SO I WAS COMPLACENT AND NOT DOUBLE CHKING MYSELF. I DID NOT VERIFY RWY ALIGNMENT BY LOOKING AT THE NUMBERS (I WAS LOOKING BUT I WAS MORE DAZEDLY FIXATED UPON IT THEN ACTUALLY SEEING IT). VISIBILITY IS EXTREMELY POOR SITTING IN THE L SEAT; MAKING A R TURN AND IT IS IMPOSSIBLE TO KEEP THE RWY IN SIGHT. I WAS KIND OF TIRED. ONLY 6 HRS OF SLEEP THE NIGHT BEFORE. I PREFER TO GET 8; BUT FUNCTIONING ON 6 IS NOT UNHEARD OF! TURN ONTO FINAL WAS OBVIOUSLY TOO SHALLOW SO THAT I GROSSLY OVERSHOT THE DESIRED RWY. (AS I ROLLED OUT I SAW THE RWY AND FIXATED ON IT. IT JUST WASN'T THE CORRECT ONE!) I DID START THINKING SOMETHING MAY HAVE BEEN WRONG ON 1 MI FINAL. I WAS LOOKING FOR AN MLG ON TKOF ROLL AND DEP AND COULDN'T FIND HIM. THEN; A WHITE LGT STARTED TAXIING ONTO THE RWY THAT I WAS LINED UP ON AND COULDN'T FIGURE OUT WHY. I DIDN'T HEAR ANY COM BTWN THE ACFT AND TWR. I WOULD HAVE FIGURED IT OUT; BUT TWR BEAT ME TO IT. I SCARED MYSELF MORE THAN ANYTHING ELSE -- THIS COULD HAVE BEEN REAL NASTY IF I HAD ROLLED OUT ON FINAL IN FRONT OF AN ACFT OR SOMETHING AND REDUCED SEPARATION OR CAUSED AN INCIDENT/ACCIDENT. MY SAVING GRACE WAS THAT IT WAS VERY QUIET THAT MORNING. FROM NOW ON I WILL NOT GET COMPLACENT AND ALWAYS DOUBLECHK ALIGNMENT BY CHKING NUMBERS; LOCS; VISUAL CUES (TAKING IN THE BIG PICTURE -- NOT JUST LOOKING OFF THE NOSE). IT'S A MENTAL ATTITUDE. DON'T TAKE ANYTHING FOR GRANTED (DO YOU FEEL LUCKY TODAY?)