It's really a pretty wide-open field. I'd start by keying up the Alliant website and see what they post in the way of light loads using, say, Red Dot. Since cost is one of your criteria, buy their Promo powder which goes for about $80+/- for an 8 lb. keg. Promo substitutes directly, weight for weight, with Red Dot and there are a lot of happy shooters out there lighting up Promo. With light loads, especially at the lower velocities, you will need a fast powder like Red Dot/Promo to get even ignition. Super Target or 700X should work well, too. Wads? I tend to spread the wealth as there are a lot of options there, too. A number of people (myself included) will report that Claybusters leave annoying plastic shreads in the barrel. Beyond that I don't think there is any magic formula or a particular brand of powder/primer/wad that you need to stand and die for.
