So after much deliberation i'm going to replace the cush drive myself. so, in my highly organised mind

i'm killing as many birds with one stone as i can when the rear wheal is off. I already decided to replace the stock rear sprocket for a betting looking one, and i'm considering changing the front sprocket. So, this is my question, how many teeth are best? i tend to get to 3rd like 1st & 2nd gear never existed, so will getting more teeth prolong my gearing my much or will i not notice?