Pretty much everything I currently own, am about to own, will one day own, or wish to own that isn't a S&W 442, Glock 19 and Colt 6920 qualifies as an irrational firearm desire.
Presently, multiple custom 1911s and a precision rifle in 6.5 Creedmore dominate the "more than I need, not as many as I want" daydreams...