I'm definitely with Dazp on this one - the UCxxx range of hardware is well-respected for general quality and reliabilty, and there is a lot of experience amongst forum members on how to install and configure. The UCCNC control software is probably the best option as well, as you are effectively starting from scratch. For your machine, the UC400ETH plus UCCNC software plus suitable cable to connect to your machine costs around euro180, although there would be import tax to pay on top. See here and here for more info, direct from the (European) manufacturer.

Not sure who gave you the WinPC recommendation, and they might be very good (although I don't remember seeing them widely used amongst forum members) but the UC series (from what I have seen at a quick look) cost no more, and are very much a known quantity. I run two of them on my own machines...