I've never had a problem with a used bike I bought. Some do need attention more than others, but if you know what to look for, or have a buddy who can help, you should be fine.
At the end of the day, YOU have to have peace of mind. If buying new gives you that, and you're able to, go new.
"If guns cause crime, then all of mine are defective." Ted Nugent
Motorcycle storage with a personal touch