I would suggest waiting until you feel comfortable, ready and financially capable of doing it. If that is for your next anniversary, then great, if isn't until your next anniversary, then you could do it then.
Whatever you do, I would suggest taking the approach of doing a vowel renewal/celebration and not a wedding. This typically means that it is not as elaborate and people do not usually bring gifts. Since you chose to have a small ceremony the first time around, that is technically your wedding...the next one is a vowel renewal.