Hello Muiruri
Welcome to the forum,
If JBL were your only choice you would be wise to select a surround speaker that voice matches the front and center. The JBL E-10, E-20, E-30 and E-50
Would be good selections. I would also lean toward the JBL subwoofer over the Sony. The E250p is respectable and the S-120P II is pretty good
If you go with the JBL E-60 or E-80 front mains select the EC-35 instead of the EC-25 center The EC-25 will have a tough time keeping up with the dynamic capability’s of these two towers thus sounding a little recessed
The EC-35 would be a much better selection. My choice would be the E-80's over the E-60's