Best bang for the buck is Alloy USA that you could get at summitracing.com for $210 + $10 shipping. The reason I'm getting these is because they come with new wheel studs, bearings, and seals!
Best--> 1541H alloy steel: Superior 31 spline $280, Alloy USA 31 spline $210
2nd Best-->1550 steel: Moser 31 spline $250, Ford Racing 31 spline $225
and here's a little insider info: Superior and Alloy usa is the same, i read somewhere one of the man guys at Superior split to create Alloy USA and uses the same method and material as Superior