Hi Dave,
I think, like everything in this world, you get what you pay for - so who is to say that the machine kit you linked to will be superior in quality to your previous machine.
I constructed my own router from scratch but it is not for the faint hearted – a lot of work and learning-as-you-go involved but equally a lot of job satisfaction as the reward. Almost all the required parts were sourced on the bay, many of which were ‘second user’ but it is not always easy to decide which are truly ‘quality parts’ and which are rubbish - I made some mistakes.
Perhaps think ahead – it may well be FR4 and PolyProp at the moment but how about the future ?
Tweakie.