When considering purchasing a CNC (Computer Numerical Control) Horizontal Machining Center, some factors to consider include:

1. The types of materials that will be machined and the required tolerances.
2. The size and weight of the parts to be machined, and the machine’s working envelope and capacity.
3. The number of axes that are required for the machining process, and the machine’s available configurations.
4. The capacity and power of the spindle, and the availability of tool changing options.
5. The size of the machining center and its suitability for the available space.
6. The availability and cost of tooling and cutting tools.
7. The ease of programming and operation of the machine, including the available of software for the machine and the ease of setup.
8. The reputation and service network of the manufacturer, and the availability of technical support and after-sales service.
9. The current automation, features and the power of the machine you are looking for.
10. The overall cost and return on investment.

It is important to have clear and specific needs before making a purchasing decision. It would be helpful to have a professional assessor or a application engineer from the manufacturer to evaluate the machine and its suitability for your application before making a final decision.