This is precisely what the Pensions Board or IFSRA should be putting resources into...the lack of information re available rates is a clear barrier to competition within the annuity market.
Sunday Times look at Annuity 'Best Buys' on a weekly basis.
The top 3 are currently New Ireland, Aviva & Zurich. Best bet might be to call each directly for a quote or else call a broker and let them find you the best deal.