Scotch - Currently can't get enough Buichladdich offerings, have a bottle of "Peat" and a bottle of "Torrey Pines" on the go now, both are pretty damned good and don't break the bank (I'm looking at you, Balblair '79...oh, why must you taunt me so?).
Irish - Jamesons (pretty much the only Irish whiskey I've consumed enough of to say I'm actually familiar with)
Bourbon - I've honestly only partaken in Jim Beam and Knob Creek, Knob Creek gets my vote.
Rye - Crown Royal Limited Edition, or, if I'm feeling spendy, Special Reserve