LJ35 OVERTAKE PA46 AND EXECUTE GAR IN BED TFC PATTERN SEQUENCING MIX-UP.

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BED'S AIRSPACE WAS SATURATED WITH VFR AND IFR TFC; AS TYPICAL ON A NICE DAY. MY FLT WAS CLRED FOR THE APCH TO RWY 11 AND HANDED OFF TO TWR BY BOS APCH AT 11.5 MI. RADIO CONGESTION PREVENTED CONTACT WITH TWR UNTIL 9 DME. TWR REQUESTED A 5 MI POS RPT. AT 6 DME MY FLT HAD TO BREAK OFF THE APCH. A PIPER MALIBU CUT US OFF ON FINAL. THE WINDSHIELD POST BLOCKED THE MALIBU FROM MY SIGHT UNTIL IT WAS DIRECTLY IN FRONT OF US (3/4 MI SEPARATION) WITH A 90 KT OVERTAKE. DURING THE BREAK AWAY MY FLT HAD A NEAR MISS WITH A SINGLE ENG CESSNA (172?). THE VERT SEPARATION WAS 300 FT. THIS WHOLE INCIDENT WAS A RESULT OF LOSS OF SITUATIONAL AWARENESS BY SEVERAL INDIVIDUALS. THE MALIBU PLT WAS ON THE WRONG DOWNWIND AND TURNED BASE/FINAL PRIOR TO US INSTEAD FOLLOWING. THE LCL CTLR LOSS SITUATIONAL AWARENESS DUE TO SEVERAL REASONS: 1) THE MALIBU NOT WHERE IT BELONGED; 2) HVY TFC; 3) ALMOST CONTINUOUS RADIO CONGESTION AND BLOCKED XMISSIONS; 4) LCL FORGOT THAT HE WAS CTLING MY FLT. THIS WAS DUE TO SEVERAL LATE HDOFS (3 MI FINALS) BY APCH PRIOR TO MY FLT. I MISSED THE COUPLE CALLS BY LCL TO THE OTHER ACFT CONCERNING MY FLT. THE FLYING SIC TOLD ME THAT TWR SAID HE WASN'T TALKING TO US. SHORTLY AFTER THE EVASIVE MANEUVERS; THERE WAS ENOUGH OF A BREAK IN THE RADIO CHATTER FOR EVERYBODY TO REGAIN SITUATIONAL AWARENESS LONG ENOUGH FOR MY FLT TO LAND. THE POOR LCL CTLR HAD ANOTHER DOZEN ACFT WAITING TO JOIN THE FREQ AT THE RWY. OUR LJ35 DOES NOT HAVE TCASII TO ENSURE TFC SITUATIONAL AWARENESS. SEE AND AVOID IS NOT ENOUGH. ALSO; THE TFC SIT AT BED IS GETTING DANGEROUSLY SATURATED WITH ALL TYPES OF ACFT AND EXPERIENCE LEVELS. BED HAS A HVY MIX OF STUDENT PLTS MIXED IN WITH HVY CPR JET OPS. AS A WHOLE; THE CTLRS AND PLTS DO AN EXCELLENT JOB; BUT TODAY PROVIDED A PERFECT EXAMPLE OF HOW FAST A SIT CAN DETERIORATE.