Power supply options

So.... I bought a controller/motor/driver/2xPower supplies set from ebay last week.. it's still on its way but I have realised that the kit I chose didn't have the power supplies in. Annoying! I thought it was a bargain :) It's too late to cancel so I need to sort out the power supply.

The kit I intended to get came with:

• 4 pcs Nema 23 stepper motor with 425 oz.in 23HS9442
  
• 4 pcs stepper motor driver DM542A, peak 4.2A, 128 micsteps, replacing M542
• 2 pcs Power supply 350Watts (36VDC/9.7A)
• 1 pc Breakout board & 1 pc Parallel cable

I did a calculation and ended up with about 11.5A power requirement.. I have a couple of options as I see it (rookie)... 2 x 350W 7.3A or 1 x 600W 12A PSU both 48V as opposed to the 36V in the version I thought I was getting.

Any ideas on what option is best for me?

You could go over to the Geckos drives site and review power supply voltage selection. They have a nice PDF that details how to do this. You need to know the motors inductance though.