Honestly if I was wanting a more all round, less aggressive tyre than the KO2, it'd be the falken wildpeak at3wa, hands down.
As for tyre size, 235/65R17 is 6% bigger than std 235/55R17, and 245/65R17 is 8% bigger.
You'd fit both on std height suspension, and 235 on lowered down to 50mm or so.