Of the choices, I voted for caliber.
But my ultimate pet peeve thread that occurs regularly is when the guy asks a question asking what we would recommend in $XX price range, and then gets responses telling him to go to $XXXX price range range.
Optics is the easiest example and it happens all the time: a guy wants a scope to hunt deer with once a year and maybe shoot at the range twice a year, and has a $200 budget. Instead of telling him that a basic 3-9 from any reputable manufacturer (Nikon, Bushnell, Vortex, Mueller, insert your favorite here) will work, someone comes along and says that unless you buy the Nightforce NXS for $2,000, you are wasting your time, maybe a $1,500 Leupold could work if you want to slum it...