440 Roller Cam suggestions

I'm slowly gathering parts for my stock-ish RB440 six pack build, and I'd like to run a stock-ish hydraulic roller cam. I want a smooth idle, and I figure stock 440+6 power is plenty for an A-body. What kind of roller cam specs will compare to the OEM .450/.458 cam? I don't mind if it's a step or maybe two steps over a stock cam, but I don't want or need a lumpy idle. Car is street-driven, and I'll use some variety of A-518 or 727 behind it. I am interested in ROLLER CAMS only.

Heads will likely be stock cast iron with some light clean up, or the Chinesium Aluminum Stealth heads from 440 Source (Ugh China).

Thanks, all you Mo'-experienced people. I don't usually build stuff like this!