Power Supply Suggestions please..

[Jonathan]

OK i did ask about off the shelf din solutions giving me the ability to simply add extra units as and when i needed them and it seemed that opinion was against that

Yes, since at the time there was no mention of powering other things. Still, I wouldn't use them for powering the other things or stepper motors since they're so much more expensive.

if that includes a 6" fan or two for cooling

My point is that may not be enough - if the transistors aren't rated for the power dissipation required it doesn't matter how big the fans are, it's not going to work (unless you split the power between multiple transistors).

So You know what i have

No, I don't know since you've not said exactly what current each of the other devices require and without that there's no point in further speculation.

What wrong using directly an AC Source? for example use directly an transformer 220AC to 110AC?

Is better to use DC Instead AC?

This thread started by discussing which PSU is most suitable for powering stepper motor drivers, which in general run from a DC source so you have to rectify the transformer output to obtain that.