A TWIN CESSNA HAS A POTENTIAL CONFLICT WITH A HELI NEAR DVT ARPT; AZ.

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ON MAR/XA/99 I WAS THE PLT OF CESSNA TWIN; AT XX30 HRS; INBOUND TO DEER VALLEY FROM TUCSON. I WAS HANDED OVER FROM PHX APCH TO DEER VALLEY TWR; WITH RADAR SVC TERMINATED AT 4000 FT MSL; CONTACT DEER VALLEY TWR PRIOR TO ENTERING THE ATA. I REDUCED PWR; STARTED MY DSCNT DOWN TO TFC PATTERN ALT AND CONTACTED THE DEER VALLEY TWR ON 118.4 JUST N OF SQUAW PEAK. I WAS INSTRUCTED BY THE TWR TO ENTER L BASE FOR RWY 25L AND CALL 3 MI OUT ON BASE. ANOTHER TWIN CESSNA CALLED E OF THE ARPT AND WAS INSTRUCTED TO MAKE A STRAIGHT-IN ENTRY TO RWY 25L. THEN A HELI CALLED STATING HE WAS S OF THE ARPT AND WAS INSTRUCTED TO MAKE AN ENTRY TO THE HELIPAD. NORMAL ENTRY FOR HELIS IS FROM S OF THE ARPT (90 DEGS TO THE RWYS) STRAIGHT-IN TO THE HELIPADS JUST S OF THE SOUTHERN MOST TXWY. I SPOTTED THE HELI SOMEWHAT E OF WHERE HE HAD RPTED TO THE TWR AND BELOW ME. AS I APCHED BELL ROAD (ABOUT 3 MI SE OF THE ARPT) THE OTHER TWIN CESSNA RPTED ON A 4 MI STRAIGHT-IN TO RWY 25L; HE WAS CLRED TO LAND #1. I LEVELED OUT AT 2500 FT; LOWERED APCH FLAPS -- TO SOW ACFT -- SPOTTED THE TWIN CESSNA ON FINAL APCH; AND BEGAN A TURN TO THE E (DOWNWIND LEG) SO AS TO SPACE MYSELF BEHIND THE ACFT AND TO HAVE SPACE TO LAND BEHIND HIM. I LOST SIGHT OF THE HELI BELOW AND TO MY L. AS I BEGAN MY TURN TO THE DOWNWIND THE HELI PLT CALLED THE TWR AND WANTED TO KNOW THE NUMBER OF THE TWIN THAT FLEW OVER HIM AT '2000 FT.' I CHKED MY ALTIMETER AND AT THAT TIME WAS STILL LEVEL AT 2500 FT. DEER VALLEY ATIS INFO GAVE THE ALTIMETER SETTING AS 29.86; AND DURING THE APCH THE TWR ANNOUNCED THAT INFO WAS CURRENT; WITH THE SAME ALTIMETER SETTING. IT WAS DIFFICULT TO COMMUNICATE WITH THE TWR AS THE HELI KEPT BLOCKING THE TWR FREQ WANTING TO KNOW WHAT THE ACFT NUMBER WAS; AND THAT HE WANTED TO MEET THE PLT ON THE RAMP. I WAS CLRED TO LAND BEHIND THE TWIN CESSNA. AFTER LNDG I TAXIED TO THE PARKING AREA AND UNLOADED THE ACFT. I WAS CARRYING CARGO WHICH IS TIME CRITICAL. I THEN WENT TO THE TELEPHONE AND CALLED THE TWR. AT THAT TIME I WAS INFORMED THAT THE HELI PLT HAD FILLED A NEAR MISS RPT. MY LAST VIEW OF THE HELI; HE APPEARED TO BE SLIGHTLY TO MY L AND BELOW ME; AND HE SHOULD HAVE BEEN HEADED TOWARDS MID FIELD. HE WAS PERHAPS 1/4 MI TO MY L; BUT AS I TURNED TOWARD THE E TO EXTEND BEHIND THE FIRST TWIN CESSNA I LOST SIGHT OF THE HELI UNDER NOSE OF MY ACFT.