Scream'n 318 ?

I like cheap, I also like some decent pistons. You want the motor to crank something decent, like higher than 150 lbs with cam chosen ,cranking.
Pistons a cost a little more also get a little lighter wait. But I guess cheap wouldn't include a balance which has gotten pretty damn expensive these days.. so I'd say some factors tied to whether you stick to stock Pistons or upgrade like rebalancing, basically ...more money.