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[routercnc]

Just noticed that I've typed Nema 24 where I should have said Nema 23 on my posts - corrected. I should also add that you need the lower inductance ones -I'm away from my computer but remember somewhere around 2-3 mH being a good choice. Hopefully someone can post up a good spec.
If you look through the build logs here you should see some of them using pulleys. Your screw pitch is very high putting a lot of load on the motor so the pulley ratio will give the motor more torque with less chance of stalling

If you want to stick with the 34s then you need to buy 4 separate stepper drivers and a break out board. This will be a lot more expensive than your current board and it's all because of your choice of motors which are a bit big for the machine you describe.
When I'm back at my computer I'll try to find the ones most people use. I think Kinko do some mains powered ones which will really make the best use of them.

This thread talks about using 34s
http://www.mycncuk.com/archive/index.php/t-8248.html