Honestly, you can go with any of the major paint manufacturers. Sherwin-Williams, DuPont (now Axalta), PPG, BASF. I have extensive experience with painting both normal collision work, restorations as well as custom paint jobs. All of those companies will give you high quality. My one recommendation when it comes to companies is, once you pick one, stick with their system from start to finish. All too often I see people use a Sherwin primer, with a DuPont base and then some PPG clear. Please stick to one company so everything works well with each other. Tip #2: You get what you pay for. A really good, high quality, high solids gallon of clear is close to $300 now BEFORE hardener and reducers. Some clears, offered by all the manufacturers are only $100 a gallon. There is a huge difference. Most guys who own a GN know what they have. They have a beautiful car, put thousands of dollars into "go-fast" parts. Spend the $$ and buy top of the line materials. I scratch my head when in this industry I am in, I see people spend $10-$20k on a restoration or body work, not counting the hours, and then scrimp and want to buy cheap products or mid-tier products. Mid-tier clears and primers will shrink back over time and die-back. Please do yourself the favor and get the good stuff, you'll thank me and yourself later! Lastly, spray gun and application has a huge outcome on the job itself. Sata, Iwata, DeVilbiss guns are good. The $50 gun from Harbor Freight is horrible. You'll be sanding your rear end off trying to get it to look good if you use one of those guns.
If you have any specific questions, ask away, I'll help you out the best I can! Good Luck!