Another vote for the 222 rem.
the 24V in 222/20 was actually fairly common although some gun collector's guides say otherwise.
I am embarrassed to say that I have owned a couple and ended up selling them, only to want another, later on down the line. Sometimes I feel like that character in Conspiracy Theory and the book Catcher in the Rye. Seems like I can't go a year without buying a 24V and shooting it, then feeling like I need something else, selling it, then getting another 24V.......
Viscous cycle. Never paid more than $350 for one, but condition has a lot to do with that.
Do like the others say and use it as a deuce-cubed. I have a 222 bolt gun and won't part with it, and with any luck, rigor mortis will help me keep that promise in perpetuity.