The size of the tire isn't that much of a problem as long as it's proportional. For instance, assuming your EX Accord is a 4-cylinder, your stock tire size is 195/65R-15. You could fit 205/60R-15 for a bit wider of a tire while keeping the overall diameter. Or you just go with stock size.

Doesn't really matter with 15's and lowering...very little chance you'd rub or anything.