€66 per person sounds very reasonable for the Shelbourne, but be very carefull about the hidden extras. Most hotels will quote a rate per person that includes flowers, toast, sherry reception etc.. You have to find out exactly what they are offering for the €66. Most hotels at this level charge an arm and a leg for the extras. It is really worth while shopping around and being flexible on your dates is a big advantage and you can get substantial discounts for mid week events. I don't know if this is an option you have considered, but getting married outside of Dublin is much cheaper. There are some wonderful hotels within 90 mins of Dublin that you should consider.