I know you said low buck but sometimes spending a bit extra is the best value. I would buy some Ross flat tops for it. You will get closer to a true 9.5 or 10-1 compression and the engine will be much more efficient. It will get better fuel mileage and make more power than with cheap, replacement, cast pistons. the pistons will cost you about $200 more than the cheapies.
I've had 440's with replacement, cast pistons in them and every one of them was a dog.

Sheldon