Not sure but have you just got a bit quote-happy...
"=IF(RC[-2]=" & strCurr1 & ",.03125,IF(RC[-2]=" & strCurr2 & ",.03125,IF(RC[-2]=" & strCurr3 & ",.03125,IF(RC[-2]=" & strCurr4 & ",.03125,IF(RC[-2]=" & strCurr5 & ",.03125,IF(RC[-2]=" & strCurr6 & ",.03125,1))))))"