Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees (12 replies)

I've been looking at 3d printing for a while now and finaly decided to take the leap and get into it (Can't wait!!!! :D :D ).

I'm looking at building the Rostock: [reprap.org]
The build platform isn't exactly large so I think I'll scale the build platform up from 200mm x 200mm to something around 350mm x 350mm. We'll see when we get there :)

I'm stuck on a buying decision: I don't know which motor to get.
Here's the ones I'm looking at getting:

#1 [www.sparkfun.com]

Step Angle (degrees) : 0.9
2-Phase
Rated Voltage: 3V
Rated Current: 1.7A/Phase
5mm Diameter Drive Shaft
Holding Torque: 48N.cm
NEMA 17 form factor

Pro's: its cheaper for me, as it will cost me $102NZD for 5 of them with free shipping. 0.9 degrees Its more precise 1.8 .
Con's : its 1.7 amps max, and I'll be using a 2amp driver so it could over heat? less torque. Will I need all that torque? I do plan to print fast :D

#2 this one: [www.trademe.co.nz]
5x Wantai motor Nema 17
Holding Torque: 4800g-cm(70oz-in)
Phase: 2 (4 wire)
Current / Phase: 2.5A

Pro's: More torque, more speed.
Con's its $145 for all 5 of them. Less resolution than option #1.


So the question is pretty much can I use motor #1 and will it be fine? Or do I need more torque?


Advice is much appreciated. :) :) :)