Hi Adam, yes the E07A is an interference engine and will cost you thousands if you let the belt snap. I've seen recommendations of changing it every 70,000km.
I use premium gas for better performance, but have used regular occasionally and get some pinging while lugging the engine.
Parts wise, there are many that are interchangeable. Best to just google the part # and see what else it fits.
Best of luck with the new Beat. Pictures! Pictures! Pictures! Please.
Barry.