Stealth heads vs Eddy performer rpm

I'm trying to hunt down parts for my 440 build but I'm hung up on heads. I had planned on getting the stealth heads from 440 source but was told to not waste my time and go with eddy's. I don't doubt that the rpm heds are better. But they also cost almost twice as much. How much more power will I get out of the $1500 rpm heads over the $900 stealth heads?
Sorry that this thread has gotten out of hand...my last remark is going to sound old school...but I shared my experience with both heads to the best of my knowledge....Quote from my own lips "You get what you pay for" and I would have bought the Indy heads if my budget could have afforded them...JMT 8)