Choosing a Power Supply?

Having more or less settled on using a Gecko drive (probably the 201) for my stepper
retrofit....

I'm now thinking that at some point I'll need a power supply!

I'm a bit "slow" when it comes to electricity.... that is, I'm ignorant...

What I THINK I need;
A power supply that will supply up to 70 VDC (the maximum that the Gecko 201 will
handle, as I read the specs), at 6Amps (I have 3 steppers rated for 2Amp per phase...
2amps times thee motors; 6 Amps?).

Given this, should I be looking for a 60-70VDC supply at 7Amps (a bit of headroom for
the motors)???

There are currently 1250 "Power Supplies" in the Business and Industrial section of eBay...
you'd think at least ONE of them would be more or less what I'm looking for, wouldn't you?

Are there any other considerations when looking for a Power Supply that I"m not aware of?

I don't have the money to buy one immediately... I want to buy the Gecko's first, then in
another month or two, I'll get the power supply about the time I have a good start on the
mechanicals of the retrofit...
I have a long way yet to go!

Any advice is appreciated!
Paul F.