I have no personal experience with any of the other Asian imports, but I've read over and over that optaining parts for Yanmars is far easier than it is for the other brands. With the newer models, you may not find the parts are stocked here in the states, but they can still be obtained.
Besides... The old Yanmar group (Now new TBN Yanmar GRoup has a world of help available.)
My 2cents
Dave