I think you should opt for 18's. anything less looks too small on a 6th gen accord. i have 18's and i'm looking at it some days and thinking "shoulda gone 19's...shoulda gone one size larger..."

if you want handling + performance, there was a road test done on the tire/rim sizing by r&t and it came out that 17" rims were the most optimal for all around performance. just an input