Affordable, I'd go with a heritage rough rider. Long accurate revolver and fun plinker.
Mark 3, 22/45 are not what I would consider affordable for a low cal gun worth little more than plinking fun, unless you want it for competition.
I'd say a Jimenez ja22 semi auto or the rough rider revolver. The Jimenez are fine in the lower caliber guns, their high cal are known for failures and low quality.