Here's the parts breakdown so far:
Stepper kit, 3 axis NEMA 23 steppers (425 Oz./3 Amp/dual shaft/4 wire) w/ drivers, power supply and DB25 cable ($309 w/ free shipping):
http://www.ebay.com/itm/300844470892?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
CNC Fusion, kit #2 w/ X,Y and Z ballscrews ($600 incl Shipping):
http://www.cncfusion.com/minimill1.html
USB Pendant, 4 axis ($25.99 w/ free shipping)
http://www.ebay.com/itm/271126015400?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
Aluminum Felx couplers (15.88 for 5 w/ free shipping)
http://www.ebay.com/itm/261072881826?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
DB25 Break Out Board ($6.50 + $2.20 shipping)
http://www.ebay.com/itm/300775143431?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
DB25 Gender changer adapter ($1.22 + 2.26 shipping)
http://www.ebay.com/itm/190685170549?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
Shielded 4 conductor, 18 Ga motor wire, 30' ($27 + $5 shipping)
http://www.ebay.com/itm/160632659191?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
4 pin XLR plugs for motor wires, 4 M&F plugs ($13.96 w/ free shipping)
http://www.ebay.com/itm/280929733116?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
DM542A 4th axis driver (identical to the ones in the 3 axis kit), 4.2 Amp rated ($36.99 + $18 shipping)
http://www.ebay.com/itm/271115223142?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
4th axis NEMA 23 stepper motor (dual shaft/ 287 Oz/ 1 Amp/ 6 wire) ($20 + $23 shipping)
http://www.ebay.com/itm/270848225792?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
20V-48V to 12V DC/3A voltage converter ($2.99 + $1.69 shipping):
http://www.ebay.com/itm/150987907819...84.m1497.l2649
20V-50V to 5V DC/3A voltage converter ($2.99 + $1.69 shipping):
http://www.ebay.com/itm/150987911654...84.m1497.l2649
12V slim (3.1"x3.1"x.6") fans (x2) ($5.98 (for 2) w/ free shipping):
http://www.ebay.com/itm/230914379043...84.m1497.l2649
UC100 cable ($129)
http://www.cnc4pc.com/Store/osc/prod...roducts_id=481
E-stop switch, A9-Latch Twist-Release ($7.50)
http://www.cnc4pc.com/Store/osc/prod...roducts_id=138
Limit switches (x6), A7, N.O. ($3.52/ea, $21.12 for 6)
http://www.cnc4pc.com/Store/osc/prod...products_id=79
*Shipping for the 3 items from www.CNC4PC.COM was $13.25 via USPS Priority mail which was the cheapest option available.
The PC's are such a big variable hardware-wise I'll just post the basic specs that pertain directly to the software requirements. Here's the minimum stated requirements I was able to find for the software I'll be using:
AutoCAD 2013 (32 bit):
OS= Win 7 (Ent., Ult., Pro. or Home), Win XP (Pro or Home) w/SP3 or later
CPU= For Win 7: Intel P4 or AMD Athalon Dual-core, 3.0GHz or higher w/SSE2 tech.; For Win XP: Intel P4 or AMD Athalon dual-core, 1.6GHz or higher w/SSE2 tech
RAM= 2GB min (4GB recommended)
HDD= 6GB free space for installation (leave extra room for files)
Monitor= 1024x768 resolution with true color minimum (1600x1050 true color recommended)
Browser= IE 7.0 or later
D2NC:
Video card= Must support OpenGL V2 Spec
Mach3:
CPU= Intel P4, 1GHz for 25KHz, 2GHz for 45KHz, faster still for 100KHz (not verified)
RAM= 512Mb min (1Gb recommended)
I'll go back and update this post if I add anything else or if I any find any corrections to the software requirements stated above.