So, I just placed an order for all the electronics parts I’ll need.  A big thank-you to John Abella for this help in choosing the steppers and power adapter.  Here’s what I bought and from where:

• Adafruit Industries
• 9 VDC 1000mA regulated switching power adapter – UL listed 
• Stepper motor – 200 steps/rev, 12V 350mA
• Micro servo
• Arduino Uno R3 (Atmega328 – assembled)
• I opted for USPS Priority Mail, total expenditure: $82.85
• MakerBot
• Adafruit Motor/Stepper/Servo Shield for Arduino Kit v1.0 (a steal at $12!)
• I opted for USPS Priority Mail, total expenditure:  $20.45