As I am standardizing on 9mm, don't live in bear country, and no longer handgun hunt, my current object o' lust is an Heirloom Precision 10mm Government Model. Might not be completely irrational, but with my checking account and lust for motorcycles on top of guns and European cars it might as well be due to its un-affordability.
Knight's SR-25, because I haven't shot my .308 bolt gun in like seven or eight years and need a reason to buy real ammunition.
SOLGW carbine because my passel of 100%-reliable-and-built-with-top-end-parts AR's are just not up to par.
Wilson .459 SOCOM AR, because I also no longer rifle hunt and need the big holes in paper to make me feel better about my receding hairline.
STI Staccato P, can the USMS be wrong? If I don't have enough bullets to fight my way out of Mogadishu and an RDS I might as well be carrying a sharp stick and a harsh word.
Langdon Beretta 1301... wait, that's not irrational at all!
I kind of surprise myself that there are only two handguns on the list, mostly because the vast majority of handguns I want aren't irrational at all.