We also went for my 30th in March, its excellent we were out there for the St Patrick's day celebrations.
We booked ours on teletext, not sure about the company but could probably find out if you like we stayed in the New Yorker hotel which was lovely about 60 storeys high. We also met the group Ash who were staying in our hotel, so it must have been pretty good. We got a really good deal and flew with Virgin