I would recomend PPG's Omni line.
They have a single stage & a Base Coat/Clear Coat in that line.
It their cheaper line for a do it yourselfer.
They can mix any manufacturers color, just nothing in the custom line of colors.

you can go single stage with stripes & then clear it but takes alot longer to do it that way , because of dry times, it makes it like a 3-5 day job instead of going base clear you can do it all in a full days work!

Base clear is pretty forgiving really , I would go that route .
(edit)
If you go base clear instead of single stage the cost comparason is about the same, once you include all the catylist you would need for all the single stage color.
Spray