I would probably avoid a machine with that type of boom it makes the machine top heavy. I know a guy with a 311 its one size bigger than that machine with the same style boom he said if you get on a slope you could roll backwards. I watched him work on a decent slope and you can tell that extra weight above the cab makes the machine a little more wobbly.
The gray market Komatsu's are the worst for parts most of those machines are painted purple from the factory and companies over here paint them Yellow. There isn't many grey market Hitachi's around the old UH machines were mostly grey market the EX series not so much.