Pci or Ethernet motion control?

[m_c]

I was looking at the 4axis controllers on ebay for 150 quid, they look like a good standalone option.

I've not looked at those in detail, however I suspect those ones will not support turn functions like threading and diameter mode. Also I'm not sure what tool offset tables the cheap controllers support. On a mill, re-zeroing isn't a major problem after tool changes, but on a lathe, it's a nightmare.