You can't have an experimental product to be reliable..... Just make it ask best, least expensive (cheap again ) so that we can test it out to find bug/problem then improve later. What is the use of a reliable product that doesn't work.
Seth what is the expected/approx power draw for the whole unit? Will a 7809 make the cut? My reason is that the stable 12V in the PC already on it limit and making 12V stable isn't easy.