Adding notes and references to things I find along the way, still researching.

Cheap TTS (like the tormach ATS without the cut ring, works with hoss style, or manufacturer has a version with ring.

http://www.ebay.com/itm/New-10pcs-C3-4-ER20A-1-38-Collet-Chuck-Straight-Collet-Chuck-CNC-Milling-Lathe-/261390401492?pt=BI_Tool_Work_Holding&hash=item3cdc14ffd4

Pre made Conversion kits

http://www.automationtechnologiesinc.com/products-page/g0704-kit/grizzly-g0704-mill-cnc-conversion-kit-mounts-with-ballnut-mounts

http://www.ebay.com/usr/cncconversionkit

Belt Drive Conversion Premade

http://www.benchtopprecision.com/bf20_belt_drive_kit.html

Bearings

Quill Drive

http://www.vxb.com/page/bearings/PROD/Nachi-Deep-Groove-Bearing/Kit9537

http://www.vxb.com/page/bearings/PROD/Nachi-Deep-Groove-Bearing/Kit9569

R8/MT3

 7007, 7005 angular contact bearings