Use a commercial grinder set between 2.25 oz and 3.0 oz of coffee per 64 oz of water.
In a primed* Bunn airpot the coffee will stay good for 4 hours.
     *Priming simply involves brewing or pouring into an already warmed airpot.
 
For this drink I would suggest a coffee that has a gentle body and finish so that the whiskey is brought to the forefront. The specific coffeee I would recomend would be the Colombian Supremo. A high grade colombian coffee like the supremo has a gentle and even variation between the intial taste, body, and finish with a pleasent aftertaste. Though this is primarily a coffee drink you don't want the whiskey to be hidden by a sour coffee or harsh aftertaste. A medium roasted coffee is preferable.
 
Guard against a dark roast with whiskey, to be careful that you don't mask the flavor of the whiskey with a harsh or bitter aftertaste in a dark roast coffee. If you must use a dark roast only use a 98% percentile grade espresso on a very course grind.

Recommended Coffees
 
Colombian Supremo $6.90 per lb.
Sumatran Manheling $6.85 per lb.

The Map Room in Cleveland Ohio will be brewing the Worlds Largest Irish Coffee on Saturday, March 21st. It will be brewed and mixed at Gillespies Map Room, 1281 W. 9th St. 216-621-7747

Jason Gartland Works for Marlowes Coffee. Marlowes is a premium provider of specialty coffees for restaurants and coffee shops. You can purchase premium coffee on their website