I've done two DK cabinets so far and both times I've rolled the paint on. I've been using Behr paint from Home Depot and it's turned out great for me. I have pics on my website if you need a visual reference.
This is my process in a nutshell:
1. Remove monitor, PCB, power supply, wiring harness, control panel, coin door, coin box, brackets, marquee, bezel.
2. Remove any stickers/old sideart/residue
3. Light sand
4. Bondo any gashes, holes, damaged corners/edges, etc. Let harden over night
5. Sand, sand, sand
6. Wipe clean
7. Tape off sides of front panels
8. Paint inner black areas, back, back door, and top. Let dry over night
9. Remove tape and tape off inner black areas
10. Apply single coat on front and side panels, let dry, repeat 3-4X
11. Light sand with sanding wool on front and side panels
I hope this helps.