Best epoxy primer

I have heard good things about SPI...so that's probably what I'll end up with.
Also, what are you guys using these days as far as respiratiors go? It's been over 20 years since I did any car painting...I'm sure things have changed. I'm not sure if I'm going to go single stage urethane or base cost clear coat? I'll be shooting the car in my detached garage, I can rig up a temp paint bay with some plastic and a good exhaust fan...so any suggestions will be greatly appreciated. Thanks for all the input...lots of knowledge here!