If you need high quality machine you shall think about USA or Japan, if you need normal quality but cheap one, think about China. Regarding to China machine, there will be no any problem in first three years, after that, you need to do some maintance, may not that well, but still acceptable. Personal experience, for reference.
China injection machine link:
Products- haitian.com - global leader in injection molding machines
The Chen Hsong Group - Home
Elite Industrial Holdings Ltd.
Anyway, maybe it is not good to operate only one or two injection molding machines in house, troublesome, maybe finally it cost more than outsoursing.