One consideration: I find it pays to have a letter/number that look pretty much the same - ie O and (numeral) 0 and I and (numeral) 1. Then if you're in a parking area where you have to enter your number to get a ticket, and get limited maximum parking time, you can get another ticket by substituting the relevant letter/number ... So far I've never copped a fine
So anything with 330 or 340 is good .. and the I is good ...