We got engaged in September and have visited about 6 or 7 venues all outside of Dublin. Most of the packages I saw are for a lot less than €120 per head and I found all of the hotels we visited were flexible on prices and corkage. From what I saw, you should have no problem with getting somewhere nice for €80 a head. Most of the places we visited also had plenty of availability for 2010.
I'd suggest that where you choose to get married/have your reception depends really on how far from Dublin you/your guests want to travel, how many guests you have, what your budget is, etc. , some of which host wedding receptions. Might give you a place to start.
Other than that, I'd suggest you think about what part of the country you want to get married in first and then search for hotels/venues there.
It can be overwhelming and time-consuming looking at venues, visiting places, etc so I would do some research first before visiting them and then limit yourself to just visiting a few.
CMCR.