your day to day running parts are easily avalable for the mazda 323 interplay and hatch, and original are also avalble from the above mentioned importers, i have been haveing my astina for over 6 years now. only hard task for me was when i busted my air flow sensor trying to be too smart.
but other than that the engines in mazda's are super durable.. mines clocked over 300,000 now.. so if u do get a good price go for it go for it.. conversions are a little hard but not impossible..