CRJ200 FLT CREW MISIDENTIFIED TXWYS AND INADVERTENTLY CROSSED THE RWY HOLD LINE; CREATING A RWY INCURSION AND TFC ON FINAL TO GO AROUND.

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TAXIING FROM RAMP; WE WERE INSTRUCTED TO TAXI TO RWY 28 VIA TURN L ON TXWY M HOLD SHORT RWY 27R AT DIXIE. WE HAD EXPECTED TO TAKE OFF ON RWY 27R SO THE CAPT CHANGED THE RWY IN THE FMS TO RWY 28 THEN WE TAXIED TO DIXIE TO HOLD SHORT OF RWY 27R THERE. AS WE APCHED DIXIE; WE WERE TOLD TO SWITCH TO TWR 123.85 AND MONITOR. TWR TOLD US TO CROSS RWY 27R; HOLD SHORT RWY 27L AT N12 AND MONITOR TWR 119.3. WE BOTH HAD OUR ARPT DIAGRAM CHARTS OUT AND I POINTED OUT AS THE CAPT TAXIED THAT N12 WAS AT THE END. THE CAPT CONCURRED; AS SHE REFED HER CHART. THE CONFUSION BEGAN WHEN WE THOUGHT WE WERE ON TXWY J WHEN IN REALITY; DIXIE HAD MERGED INTO TXWY K AS WE CROSSED RWY 27R. THINKING WE WERE ON TXWY J; WE EXPECTED TO TAXI TO N12 ON TXWY J AS THERE IS A SOLID SLAB OF CONCRETE JOINING N12 TO TXWY J; UNLIKE THE DEPICTION ON THE ARPT DIAGRAM. AS WE CROSSED TXWY N; TWR SAID TO 'TURN L AND TAXI TO THE APCH END OF RWY 27L.' AS IT WAS TOO LATE TO TURN ON TXWY N; WE ASSUMED HE MEANT THE NEXT L; WHICH WAS RWY 27L. WE REALIZED SOMETHING WAS WRONG WHEN WE SAW THE COMPANY ACFT ON 1 1/2 MI FINAL ON RWY 27L AND STOPPED WITH OUR NOSE OVER THE HOLD SHORT LINE ABOUT 10-15 FT. TWR INSTRUCTED COMPANY TFC TO GO AROUND AND THEN CLRED US TO CROSS RWY 27L; JOIN TXWY R AND TAXI TO RWY 28. PART OF THE CONFUSION WAS THE ACFT IN FRONT OF US THAT GOT THE SAME INSTRUCTIONS AND USED THE SAME RTE.