I did AV for a theme park in '99, and have done AV for several themed restaurants since then. When you're talking about putting together a system that's expected to run without a hitch 14 - 18 hours a day, 7 days a week, it's a lot like putting together a server you know will need high availability and reliability. Don't shoot yourself in the foot by getting something mediocre to do the job. The rule of thumb in theme/amusement park AV is to use solid state as much as possible (minimize your downtime to the extreme).
My personal gear of choice is Alcorn McBride (alcorn.com). They have an 8 track unit that would to what you need it to do. I've used several of the binloop over the years, and with a near zero issue rate (and what issues I did have were due to a missing firmware update).
And as a matter of disclosure, I did become a dealer for them after becoming familiar with their gear on the '99 project.