What sort of kit is best for you depends on your circumstances:
- Are you looking for a budget kit to get you started and see whether you like doing 3D printing, or are you prepared to spend a lot more for something that will print really well without needing a lot of upgrading and tweaking?
- What are your levels of electronics and mechanical engineering knowledge?
Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod
Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].