I got these motors:
http://www.ebay.co.uk/itm/111412185294?_trksid=p2057872.m2749.l2648&ssPageName=STRK%3AMEBIDX%3AIT
I think the guy selling them has a pretty sweet setup - he's put his own stickers on them, with a model number. If you look up the model on alibaba/express there's only one place selling them - for slightly more than this guy is in the UK. I suspect he's struck a deal there, somehow
:D
Anyway, I think the price is pretty fair - they seem to be very strong (see video up there ^^^ ) and they're dual shaft so I can stick a rotary encoder on the back end for feedback.
As for guides, well I've been wanting to do this project for about 6 years or more. I've read countless forum threads, instructables, hackaday articles etc. There's not really any one guide I've followed, more a case of trying to understand the various theories of operation and then design my own system. CNCZone.com is a pretty active forum.
To be honest, if I was in teh USA I'd probably just have bought a Shapeoko 2 machine. But the shipping costs to the UK are ridiculous. I think the unit costs about $600 delivered in the US, over here it's about £680 (plus potential import duties etc.)