I went ahead and put an order in this morning for some stuff I needed...

1 x 10 Foot Parallel Port Cable
4 x CNC Motor Cable Length 12 Foot
1 x Zero Backlash Helical Shaft Coupler
2 x Rack and Pinion Drive, Nema 23 - (I already have one)
---Pinion Gear Pitch 20 Pitch (Moore Gear)
---Pivot Standard
---Pulley 20 tooth with 1/4" bore (standard)
1 x 1/2" Shaft Collar
8 x Limit Switch
6 x Extended Linear Carriage with ABEC 7 Bearings and 2 Tapped Holes for R&P
1 x 1/2" Shaft Adapter
1 x 1/2" Needle Thrust Bearing and Washers