I bought the UC300eth, ucbb, cables, uccnc, 'kit', plus another ucbb spare from cncdrive.
Then bought a £100ish HP laptop to run it from.
I have ZERO regrets. It's smooooth.

If you're in UK. Cnc4you.co.uk carry the UC100 and UC400eth.
Also, cncroom.com have some good kit if you want to full on start over.