You really need to figure out what car this is that you are being offered. There wasn't a 325 anything in 1999. The last remaining E36s were 323's and 328's, and M3 coupes and convertibles. The E46's were 323i and 328i sedans.
So, if it has four doors and it is a 1999, it can't be neither an M3 nor a 325.
As far as hard to maintain: you just need to stay on top o the regular maintenance. Nothing special.
The Achilles heel for most BMW's is the cooling system. Ensure that it has been serviced recently, or be ready to service after acquisition.
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