ACR X POSSIBLE RWY INCURSION DUE TO PROX OF RWYS.

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I WAS SET UP FOR THIS ONE! TWR WAS TALKING VERY FAST; TRYING TO MOVE THE TFC (PRACTICE SPEAKING SLOWER?). TWR SAID; I KNOW; 'TAXI INTO POS....' IN HINDSIGHT; I HAVE TO ASSUME IT WAS; OR HE MEANT; 'TAXI INTO POS RWY 28; HOLD SHORT RWY 23L.' IN RETROSPECT; HE MAY HAVE ACTUALLY CLRED ME. HE HAD ALMOST IN THE SAME BREATH TOLD A B737 IN POS ON RWY 28; TFC WOULD BE DEPARTING RWY 23L; THEN HE TOLD US; AFTER; TFC WOULD HOLD ON RWY 28 FOR US. BOTTOM LINE IS: I WAS READY TO GO INTO POS AND HOLD ON RWY 23L; EXPECT.... THERE WAS A COMMUTER ON FINAL. THE VISIBILITY WAS NOT GREAT (APPROX 5 MI AND HAZY/FOG) INTO THE MORNING SUN. ONCE YOU MAKE THE TURN HERE; THE CAPT'S VISIBILITY IS BLOCKED TOWARDS THE FINAL APCH AREA. I NEVER SAW THE COMMUTER TILL AFTER THE TWR SAID 'HOLD SHORT.' SUGGEST CLE TWR STANDARDIZE VERBIAGE ON THIS CLRNC AND REMOVE ANY REF TO 'POS.' I THOUGHT I WAS CLRED BUT I REALLY DON'T REMEMBER EXACTLY WHAT WAS SAID AFTER 'TAXI INTO POS....' PERHAPS 'TAXI ONTO RWY 28; HOLD SHORT RWY 23L.' WE HELD SHORT; BUT TWR COULD SEE I WAS GOING TO KEEP GOING. THEY CALLED US JUST IN TIME. WHERE WAS MY FO? BEING THE STRONG SILENT TYPE I GUESS.